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Thongyuan S, Thanongsaksrikul J, Srimanote P, Phongphaew W, Eiamcharoen P, Thengchaisri N, Bosco-Lauth A, Decaro N, Yodsheewan R. Seroprevalence of Anti-SARS-CoV-2 Antibodies in Cats during Five Waves of COVID-19 Epidemic in Thailand and Correlation with Human Outbreaks. Animals (Basel) 2024; 14:761. [PMID: 38473145 DOI: 10.3390/ani14050761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2024] [Revised: 02/14/2024] [Accepted: 02/27/2024] [Indexed: 03/14/2024] Open
Abstract
Human-to-animal SARS-CoV-2 transmission was observed, including a veterinarian contracting COVID-19 through close contact with an infected cat, suggesting an atypical zoonotic transmission. This study investigated the prevalence of SARS-CoV-2 antibodies in cats during human outbreaks and elucidated the correlation between cat infections and human epidemics. A total of 1107 cat serum samples were collected and screened for SARS-CoV-2 antibodies using a modified indirect ELISA human SARS-CoV-2 antibody detection kit. The samples were confirmed using a cPass™ neutralization test. The SARS-CoV-2 seropositivity rate was 22.67% (199/878), mirroring the trend observed in concomitant human case numbers. The waves of the epidemic and the provinces did not significantly impact ELISA-positive cats. Notably, Chon Buri exhibited a strong positive correlation (r = 0.99, p = 0.009) between positive cat sera and reported human case numbers. Additionally, the cPass™ neutralization test revealed a 3.99% (35/878) seropositivity rate. There were significant differences in numbers and proportions of positive cat sera between epidemic waves. In Samut Sakhon, a positive correlation (r = 1, p = 0.042) was noted between the proportion of positive cat sera and human prevalence. The findings emphasize the need for ongoing surveillance to comprehend SARS-CoV-2 dynamics in both human and feline populations.
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Affiliation(s)
- Suporn Thongyuan
- Department of Veterinary Public Health, Faculty of Veterinary Medicine, Kasetsart University, Kamphaeng Saen Campus, Nakhon Pathom 73140, Thailand
| | - Jeeraphong Thanongsaksrikul
- Graduate Program in Biomedical Sciences, Faculty of Allied Health Sciences, Thammasat University, Pathumtani 12121, Thailand
| | - Potjanee Srimanote
- Graduate Program in Biomedical Sciences, Faculty of Allied Health Sciences, Thammasat University, Pathumtani 12121, Thailand
| | - Wallaya Phongphaew
- Department of Pathology, Faculty of Veterinary Medicine, Kasetsart University, Bangkok 10900, Thailand
| | - Piyaporn Eiamcharoen
- Department of Pathology, Faculty of Veterinary Medicine, Kasetsart University, Bangkok 10900, Thailand
| | - Naris Thengchaisri
- Department of Companion Animal Clinical Sciences, Faculty of Veterinary Medicine, Kasetsart University, Bangkok 10900, Thailand
| | - Angela Bosco-Lauth
- Department of Biomedical Sciences, Colorado State University, 3107 W Rampart Road, Fort Collins, CO 80523, USA
| | - Nicola Decaro
- Department of Veterinary Medicine, University of Bari, Strada Provinciale per Casamassima, Valenzano, 70010 Bari, Italy
| | - Rungrueang Yodsheewan
- Department of Pathology, Faculty of Veterinary Medicine, Kasetsart University, Bangkok 10900, Thailand
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Hur J, Jung HK, Park SW. Development of an indirect ELISA system for diagnosis of porcine edema disease using recombinant modified Stx2e antigen. J Appl Microbiol 2024; 135:lxae021. [PMID: 38285612 DOI: 10.1093/jambio/lxae021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Revised: 01/17/2024] [Accepted: 01/27/2024] [Indexed: 01/31/2024]
Abstract
AIM This study aimed to develop a sensitive and specific recombinant antigen protein indirect enzyme-linked immunosorbent assay (ELISA) kit to detect the Shiga toxin (Stx)-producing Escherichia coli (STEC) antibodies against porcine edema disease (ED). METHODS AND RESULTS The recombinant antigen was co-expressed with the STEC-derived Stx2e A2-fragment and Stx2e B protein in E. coli BL21(DE3) pLysS cells and purified using maltose-binding protein open columns. We used a Shiga-like toxin 2 antibody to test the specificity of the recombinant antigen in an indirect ELISA, which was detected in antigen-coated wells but not in uncoated wells. We tested the indirect ELISA system using samples from the STEC-immunized pig group, the commercial swine farm group, and healthy aborted fetal pleural effusion group; five and twenty samples, respectively, were positive for STEC in the former, whereas all three samples were negative for STEC in the latter. CONCLUSIONS This newly developed indirect ELISA may be a specific method for diagnosing STEC infections in pigs.
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Affiliation(s)
- Jin Hur
- Department of Veterinary Public Health, College of Veterinary Medicine, Jeonbuk National University, Iksan-si, Jeollabuk-do 54596, Republic of Korea
| | - Ho-Kyoung Jung
- CTCVAC Inc., 106, Saengmyeonggwahakgwan-gil, Hongcheon-eup, Hongcheon-gun, Gangwon-do 25142, Republic of Korea
| | - Seung-Won Park
- Department of Biomedical Science, Daegu Catholic University, Gyeongsan-si, Gyeongsangbuk-do 38430, Republic of Korea
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Niu X, Liu Q, Wang P, Zhang G, Jiang L, Zhang S, Zeng J, Yu Y, Wang Y, Li Y. Establishment of an Indirect ELISA Method for the Detection of the Bovine Rotavirus VP6 Protein. Animals (Basel) 2024; 14:271. [PMID: 38254440 PMCID: PMC10812791 DOI: 10.3390/ani14020271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 12/28/2023] [Accepted: 01/10/2024] [Indexed: 01/24/2024] Open
Abstract
The objective of this study was to develop an indirect ELISA utilizing a polyclonal antibody against bovine rotavirus (BRV) VP6 protein. To achieve this, pcDNA3.1-VP6, a recombinant eukaryotic expression plasmid, was constructed based on the sequence of the conserved BRV gene VP6 and was transfected into CHO-K1 cells using the transient transfection method. The VP6 protein was purified as the coating antigen using nickel ion affinity chromatography, and an indirect ELISA was subsequently established. The study found that the optimal concentration of coating for the VP6 protein was 1 μg/mL. The optimal blocking solution was 3% skim milk, and the blocking time was 120 min. The secondary antibody was diluted to 1:4000, and the incubation time for the secondary antibody was 30 min. A positive result was indicated when the serum OD450 was greater than or equal to 0.357. The coefficients of variation were less than 10% both within and between batches, indicating the good reproducibility of the method. The study found that the test result was positive when the serum dilution was 217, indicating the high sensitivity of the method. A total of 24 positive sera and 40 negative sera were tested using the well-established ELISA. The study also established an indirect ELISA assay with good specificity and sensitivity for the detection of antibodies to bovine rotavirus. Overall, the results suggest that the indirect ELISA method developed in this study is an effective test for detecting such antibodies.
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Affiliation(s)
- Xiaoxia Niu
- School of Life Sciences, Ningxia University, Yinchuan 750021, China; (X.N.); (Q.L.); (P.W.); (G.Z.); (L.J.); (S.Z.); (J.Z.); (Y.Y.)
- Key Laboratory of Ministry of Education for Conservation and Utilization of Special Biological Resources in the Western, Ningxia University, Yinchuan 750021, China
| | - Qiang Liu
- School of Life Sciences, Ningxia University, Yinchuan 750021, China; (X.N.); (Q.L.); (P.W.); (G.Z.); (L.J.); (S.Z.); (J.Z.); (Y.Y.)
- Key Laboratory of Ministry of Education for Conservation and Utilization of Special Biological Resources in the Western, Ningxia University, Yinchuan 750021, China
| | - Pu Wang
- School of Life Sciences, Ningxia University, Yinchuan 750021, China; (X.N.); (Q.L.); (P.W.); (G.Z.); (L.J.); (S.Z.); (J.Z.); (Y.Y.)
- Key Laboratory of Ministry of Education for Conservation and Utilization of Special Biological Resources in the Western, Ningxia University, Yinchuan 750021, China
| | - Gang Zhang
- School of Life Sciences, Ningxia University, Yinchuan 750021, China; (X.N.); (Q.L.); (P.W.); (G.Z.); (L.J.); (S.Z.); (J.Z.); (Y.Y.)
- Key Laboratory of Ministry of Education for Conservation and Utilization of Special Biological Resources in the Western, Ningxia University, Yinchuan 750021, China
| | - Lingling Jiang
- School of Life Sciences, Ningxia University, Yinchuan 750021, China; (X.N.); (Q.L.); (P.W.); (G.Z.); (L.J.); (S.Z.); (J.Z.); (Y.Y.)
- Key Laboratory of Ministry of Education for Conservation and Utilization of Special Biological Resources in the Western, Ningxia University, Yinchuan 750021, China
| | - Sinong Zhang
- School of Life Sciences, Ningxia University, Yinchuan 750021, China; (X.N.); (Q.L.); (P.W.); (G.Z.); (L.J.); (S.Z.); (J.Z.); (Y.Y.)
- Key Laboratory of Ministry of Education for Conservation and Utilization of Special Biological Resources in the Western, Ningxia University, Yinchuan 750021, China
| | - Jin Zeng
- School of Life Sciences, Ningxia University, Yinchuan 750021, China; (X.N.); (Q.L.); (P.W.); (G.Z.); (L.J.); (S.Z.); (J.Z.); (Y.Y.)
- Key Laboratory of Ministry of Education for Conservation and Utilization of Special Biological Resources in the Western, Ningxia University, Yinchuan 750021, China
| | - Yongtao Yu
- School of Life Sciences, Ningxia University, Yinchuan 750021, China; (X.N.); (Q.L.); (P.W.); (G.Z.); (L.J.); (S.Z.); (J.Z.); (Y.Y.)
- Key Laboratory of Ministry of Education for Conservation and Utilization of Special Biological Resources in the Western, Ningxia University, Yinchuan 750021, China
| | - Yujiong Wang
- School of Life Sciences, Ningxia University, Yinchuan 750021, China; (X.N.); (Q.L.); (P.W.); (G.Z.); (L.J.); (S.Z.); (J.Z.); (Y.Y.)
- Key Laboratory of Ministry of Education for Conservation and Utilization of Special Biological Resources in the Western, Ningxia University, Yinchuan 750021, China
| | - Yong Li
- School of Life Sciences, Ningxia University, Yinchuan 750021, China; (X.N.); (Q.L.); (P.W.); (G.Z.); (L.J.); (S.Z.); (J.Z.); (Y.Y.)
- Key Laboratory of Ministry of Education for Conservation and Utilization of Special Biological Resources in the Western, Ningxia University, Yinchuan 750021, China
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Li Y, Wang Q, Yue W, Li X, Chen Y, Gao Y. Expression and self-assembly of virus-like particles from porcine parvovirus and its application in antibody detection. Pol J Vet Sci 2023; 26:591-609. [PMID: 38088304 DOI: 10.24425/pjvs.2023.148280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2023]
Abstract
Porcine parvovirus (PPV) is a major causative agent in reproductive pig disease. The swine industry faces a significant economic and epizootic threat; thus, finding a reliable, quick, and practical way to detect it is essential. In this investigation, recombinant PPV VP2 protein was expressed in the Escherichia coli ( E. coli) expression systems. As shown by electron microscopy (TEM), Western blot, and hemagglutination (HA) assays, the recombinant VP2 protein was successfully assembled into virus-like particles (VLPs) after being expressed and purified. These VLPs had a structure that was similar to that of real PPV viruses and also exhibited HA activity. These VLPs induced high levels of PPV-specific antibody titers in mice after immunization, indicating that the VLPs may be beneficial as potential candidate antigens. VLPs were used as the coating antigens for the VLP ELISA, and the PPV VLPs-based ELISA displayed a high sensitivity (99%), specificity (93.0%) and agreement rate (98.3%) compared to HI assay, and the agreement rate of this ELISA was 97.5% compared to a commercial ELISA kit. Within a plate, the coefficient of variation (CV) was 10%, and between ELISA plates, the CV was 15%. According to a cross-reactivity assay, the technique was PPV-specific in contrast to other viral illness sera. The PPV VLP indirect-ELISA test for PPV detection in pigs with an inactivated vaccine showed that the PPV-positive rate varied among different sample sources from 88.2 to 89.6%. Our results indicate that this ELISA technique was quick, accurate, and repeatable and may be used for extensive serological research on PPV antibodies in pigs.
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Affiliation(s)
- Y Li
- Beijing Biomedicine Technology Center of JoFunHwa Biotechnology (Nanjing Co. Ltd.); No.25 Xiangrui Street Daxing District, Beijing 102600 China
| | - Q Wang
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150001, China
| | - W Yue
- Beijing Biomedicine Technology Center of JoFunHwa Biotechnology (Nanjing Co. Ltd.); No.25 Xiangrui Street Daxing District, Beijing 102600 China
| | - X Li
- Beijing Biomedicine Technology Center of JoFunHwa Biotechnology (Nanjing Co. Ltd.); No.25 Xiangrui Street Daxing District, Beijing 102600 China
| | - Y Chen
- Beijing Biomedicine Technology Center of JoFunHwa Biotechnology (Nanjing Co. Ltd.); No.25 Xiangrui Street Daxing District, Beijing 102600 China
| | - Y Gao
- Beijing Biomedicine Technology Center of JoFunHwa Biotechnology (Nanjing Co. Ltd.); No.25 Xiangrui Street Daxing District, Beijing 102600 China
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Pikula J, Brichta J, Seidlova V, Piacek V, Zukal J. Higher antibody titres against Pseudogymnoascus destructans are associated with less white-nose syndrome skin lesions in Palearctic bats. Front Immunol 2023; 14:1269526. [PMID: 38143741 PMCID: PMC10739372 DOI: 10.3389/fimmu.2023.1269526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2023] [Accepted: 11/28/2023] [Indexed: 12/26/2023] Open
Abstract
Introduction Serological tests can be used to test whether an animal has been exposed to an infectious agent, and whether its immune system has recognized and produced antibodies against it. Paired samples taken several weeks apart then document an ongoing infection and/or seroconversion. Methods In the absence of a commercial kit, we developed an indirect enzyme-linked immunosorbent assay (ELISA) to detect the fungus-specific antibodies for Pseudogymnoascus destructans, the agent of white-nose syndrome in bats. Results and Discussion Samples collected from European Myotis myotis (n=35) and Asian Myotis dasycneme (n=11) in their hibernacula at the end of the hibernation period displayed 100% seroprevalence of antibodies against P. destructans, demonstrating a high rate of exposure. Our results showed that the higher the titre of antibodies against P. destructans, the lower the infection intensity, suggesting that a degree of protection is provided by this arm of adaptive immunity in Palearctic bats. Moreover, P. destructans infection appears to be a seasonally self-limiting disease of Palearctic bats showing seroconversion as the WNS skin lesions heal in the early post-hibernation period.
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Affiliation(s)
- Jiri Pikula
- Department of Ecology and Diseases of Zoo Animals, Game, Fish and Bees, University of Veterinary Sciences Brno, Brno, Czechia
- CEITEC: Central European Institute of Technology, University of Veterinary Sciences Brno, Brno, Czechia
| | - Jiri Brichta
- Department of Ecology and Diseases of Zoo Animals, Game, Fish and Bees, University of Veterinary Sciences Brno, Brno, Czechia
| | - Veronika Seidlova
- Department of Ecology and Diseases of Zoo Animals, Game, Fish and Bees, University of Veterinary Sciences Brno, Brno, Czechia
| | - Vladimir Piacek
- Department of Ecology and Diseases of Zoo Animals, Game, Fish and Bees, University of Veterinary Sciences Brno, Brno, Czechia
| | - Jan Zukal
- Institute of Vertebrate Biology, Czech Academy of Sciences, Brno, Czechia
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Bibi N, Wajeeha AW, Mukhtar M, Tahir M, Zaidi NUSS. In Vivo Validation of Novel Synthetic tbp1 Peptide-Based Vaccine Candidates against Haemophilus influenzae Strains in BALB/c Mice. Vaccines (Basel) 2023; 11:1651. [PMID: 38005983 PMCID: PMC10675187 DOI: 10.3390/vaccines11111651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 09/16/2023] [Accepted: 10/16/2023] [Indexed: 11/26/2023] Open
Abstract
Haemophilus influenzae is a Gram-negative bacterium characterized as a small, nonmotile, facultative anaerobic coccobacillus. It is a common cause of a variety of invasive and non-invasive infections. Among six serotypes (a-f), H. influenzae type b (Hib) is the most familiar and predominant mostly in children and immunocompromised individuals. Following Hib vaccination, infections due to other serotypes have increased in number, and currently, there is no suitable effective vaccine to induce cross-strain protective antibody responses. The current study was aimed to validate the capability of two 20-mer highly conserved synthetic tbp1 (transferrin-binding protein 1) peptide-based vaccine candidates (tbp1-E1 and tbp1-E2) predicted using in silico approaches to induce immune responses against H. influenzae strains. Cytokine induction ability, immune simulations, and molecular dynamics (MD) simulations were performed to confirm the candidacy of epitopic docked complexes. Synthetic peptide vaccine formulations in combination with two different adjuvants, BGs (Bacterial Ghosts) and CFA/IFA (complete/incomplete Freund's adjuvant), were used in BALB/c mouse groups in three booster shots at two-week intervals. An indirect ELISA was performed to determine endpoint antibody titers using the Student's t-distribution method. The results revealed that the synergistic use of both peptides in combination with BG adjuvants produced better results. Significant differences in absorbance values were observed in comparison to the rest of the peptide-adjuvant combinations. The findings of this study indicate that these tbp1 peptide-based vaccine candidates may present a preliminary set of peptides for the development of an effective cross-strain vaccine against H. influenzae in the future due to their highly conserved nature.
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Affiliation(s)
- Naseeha Bibi
- Vaccinology and Therapeutics Research Group, Department of Industrial Biotechnology, Atta Ur Rahman School of Applied Biosciences (ASAB), National University of Sciences and Technology (NUST), Islamabad 44000, Pakistan; (N.B.); (A.W.W.); (M.M.)
| | - Amtul Wadood Wajeeha
- Vaccinology and Therapeutics Research Group, Department of Industrial Biotechnology, Atta Ur Rahman School of Applied Biosciences (ASAB), National University of Sciences and Technology (NUST), Islamabad 44000, Pakistan; (N.B.); (A.W.W.); (M.M.)
| | - Mamuna Mukhtar
- Vaccinology and Therapeutics Research Group, Department of Industrial Biotechnology, Atta Ur Rahman School of Applied Biosciences (ASAB), National University of Sciences and Technology (NUST), Islamabad 44000, Pakistan; (N.B.); (A.W.W.); (M.M.)
| | - Muhammad Tahir
- Department of Plant Biotechnology, Atta Ur Rahman School of Applied Biosciences (ASAB), National University of Sciences and Technology (NUST), Islamabad 44000, Pakistan;
| | - Najam us Sahar Sadaf Zaidi
- Vaccinology and Therapeutics Research Group, Department of Industrial Biotechnology, Atta Ur Rahman School of Applied Biosciences (ASAB), National University of Sciences and Technology (NUST), Islamabad 44000, Pakistan; (N.B.); (A.W.W.); (M.M.)
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Wu Z, Lu H, Zhu D, Xie J, Sun F, Xu Y, Zhang H, Wu Z, Xia W, Zhu S. Developing an Indirect ELISA for the Detection of African Swine Fever Virus Antibodies Using a Tag-Free p15 Protein Antigen. Viruses 2023; 15:1939. [PMID: 37766344 PMCID: PMC10534517 DOI: 10.3390/v15091939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 09/01/2023] [Accepted: 09/14/2023] [Indexed: 09/29/2023] Open
Abstract
African swine fever (ASF) is one of the most severe diseases caused by the ASF virus (ASFV), causing massive economic losses to the global pig industry. Serological tests are important in ASF epidemiological surveillance, and more antigen targets are needed to meet market demand for ASFV antibody detection. In the present study, ASFV p15 protein was fusion-expressed in Escherichia coli (E. coli) with elastin-like polypeptide (ELP), and the ELP-p15 protein was purified using a simple inverse transition cycling (ITC) process. The ELP tag was cleaved off using tobacco etch virus protease (TEVp), resulting in a tag-free p15 protein. Western blot analysis demonstrated that the p15 protein reacted strongly with ASFV-positive serum. The p15 protein was used as a coating antigen in an indirect ELISA (iELISA) for detecting ASFV antibodies. The p15-iELISA method demonstrated high specificity to ASFV-positive sera, with a maximum detection dilution of 1:1600. Moreover, the method exhibited good reproducibility, with less intra-assay and inter-assay CV values than 10%. Therefore, p15-iELISA offers a novel approach for accurately detecting ASFV antibodies with significant clinical application potential.
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Affiliation(s)
- Zhi Wu
- Jiangsu Key Laboratory for High-Tech Research and Development of Veterinary Biopharmaceuticals, Jiangsu Agri-Animal Husbandry Vocational College, Taizhou 225300, China; (Z.W.); (H.L.); (J.X.); (F.S.); (Y.X.)
| | - Huipeng Lu
- Jiangsu Key Laboratory for High-Tech Research and Development of Veterinary Biopharmaceuticals, Jiangsu Agri-Animal Husbandry Vocational College, Taizhou 225300, China; (Z.W.); (H.L.); (J.X.); (F.S.); (Y.X.)
| | - Dewei Zhu
- Yancheng Engineering Research Center of Animal Biologics, School of Marine and Biological Engineering, Yancheng Teachers University, Yancheng 224007, China;
| | - Jun Xie
- Jiangsu Key Laboratory for High-Tech Research and Development of Veterinary Biopharmaceuticals, Jiangsu Agri-Animal Husbandry Vocational College, Taizhou 225300, China; (Z.W.); (H.L.); (J.X.); (F.S.); (Y.X.)
| | - Fan Sun
- Jiangsu Key Laboratory for High-Tech Research and Development of Veterinary Biopharmaceuticals, Jiangsu Agri-Animal Husbandry Vocational College, Taizhou 225300, China; (Z.W.); (H.L.); (J.X.); (F.S.); (Y.X.)
| | - Yan Xu
- Jiangsu Key Laboratory for High-Tech Research and Development of Veterinary Biopharmaceuticals, Jiangsu Agri-Animal Husbandry Vocational College, Taizhou 225300, China; (Z.W.); (H.L.); (J.X.); (F.S.); (Y.X.)
| | - Hua Zhang
- School of Pharmacy, Yancheng Teachers University, Yancheng 224007, China; (H.Z.); (Z.W.)
- Jiangsu Province Engineering Research Center of Tumor Targeted Nano Diagnostic and Therapeutic Materials, Yancheng Teachers University, Yancheng 224007, China
| | - Zhijun Wu
- School of Pharmacy, Yancheng Teachers University, Yancheng 224007, China; (H.Z.); (Z.W.)
- Jiangsu Province Engineering Research Center of Tumor Targeted Nano Diagnostic and Therapeutic Materials, Yancheng Teachers University, Yancheng 224007, China
| | - Wenlong Xia
- Yancheng Engineering Research Center of Animal Biologics, School of Marine and Biological Engineering, Yancheng Teachers University, Yancheng 224007, China;
| | - Shanyuan Zhu
- Jiangsu Key Laboratory for High-Tech Research and Development of Veterinary Biopharmaceuticals, Jiangsu Agri-Animal Husbandry Vocational College, Taizhou 225300, China; (Z.W.); (H.L.); (J.X.); (F.S.); (Y.X.)
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Dahl MLN, Mikkelsen JH, Hvid M, Korsholm TL, Nielsen KO, Andersen CBF, Greisen S, Deleuran B. Validation of an indirect ELISA assay for assessment of autoantibodies against full-length TRIM21 and its individual domains. Scand J Clin Lab Invest 2023; 83:309-317. [PMID: 37379227 DOI: 10.1080/00365513.2023.2221862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Revised: 03/24/2023] [Accepted: 05/29/2023] [Indexed: 06/30/2023]
Abstract
Anti-SSA-autoantibodies are common in patients with rheumatologic disease, especially Sjögren's syndrome, systemic lupus erythematosus and rheumatoid arthritis. They consist of both autoantibodies towards Ro60 and Ro52, the latter also known as TRIM21. TRIM21 is an intracellular protein consisting of four domains; PRY/SPRY, Coiled-Coil, B-box and RING. The aim of this study was to establish an indirect ELISA detecting autoantibodies towards both the full-length TRIM21 protein and its four domains. We expressed the five constructs, created, and validated indirect ELISA protocols for each target using plasma from anti-SSA positive patients and healthy controls. Our findings were validated to the clinically used standards. We measured significantly higher levels of autoantibodies towards our full-length TRIM21, and the PRY/SPRY, Coiled-Coil and RING domains in patients compared to healthy controls. No significant difference in the level of autoantibodies were detected against the B-box domain. Our setups had a signal to noise ratio in the range of 30 to 184, and an OD between 2 and 3. Readings did not decline using NaCl of 500 mM as wash, affirming the high binding affinity of the autoantibodies measured. Our protocols allow us to further study the different autoantibodies of anti-SSA positive patients. This creates the possibility to stratify our patients into subgroups regarding autoantibody profile and specific pheno- or endotype.
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Affiliation(s)
- Marie Louise Næstholt Dahl
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
- Department of Rheumatology, Aarhus University Hospital, Aarhus, Denmark
| | | | - Malene Hvid
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
- Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - Trine-Line Korsholm
- Department of Clinical Immunology, Aarhus University Hospital, Aarhus, Denmark
| | | | | | - Stinne Greisen
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
- Department of Rheumatology, Aarhus University Hospital, Aarhus, Denmark
| | - Bent Deleuran
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
- Department of Rheumatology, Aarhus University Hospital, Aarhus, Denmark
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Liaqat S, Qayyum M, Celik F, Simsek S, Ahmad F, Zhang X, Ahmed H, Cao J. Comparative Analysis of Different ELISA Methods for the Serodiagnosis of Przhevalskiana silenus Infestation in Goats. Vet Sci 2023; 10:396. [PMID: 37368782 DOI: 10.3390/vetsci10060396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 05/18/2023] [Accepted: 06/05/2023] [Indexed: 06/29/2023] Open
Abstract
Przhevalskiana silenus (warble fly) grubs cause myiasis in goats, in mountainous and semi-mountainous areas and different regions in Pakistan, and cause substantial losses to livestock. The palpation method for detecting warble flies generally neglects the infestation intensity; therefore, the development of a reliable and efficient diagnostic technique is extremely necessary. This study compared three indirect enzyme-linked immunosorbent assay (ELISA) methods for detecting anti-P. silenus antibodies using the hypodermin C (HyC) purified from Hypoderma spp. Larvae collected in cattle (local isolate, Microbiology Laboratory, PMAS-Arid Agriculture University, Rawalpindi), the crude antigen from the first instar stage of P. silenus, and a commercial Bovine Hypodermosis Antibody ELISA kit (IDEXX Laboratory), for accurately estimating the seroprevalence of goat warble fly infestation (GWFI) in the Pothwar plateau, Punjab, Pakistan. The ELISA with the crude antigen of P. silenus proved very sensitive and specific, 91% and 93%, respectively. The optical density exhibited a monthly variation, and the antibody titer began increasing from June, continually increased from July to December, and gradually decreased thereafter until March. The study confirmed the endemic status of GWFI in the Pothwar region and identified that ELISA based on the crude antigen of P. silenus was a more sensitive and specific immunodiagnostic method for determining seroprevalence, and could be employed for initiating nationwide eradication campaigns.
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Affiliation(s)
- Sadia Liaqat
- Department of Zoology, PMAS Arid Agriculture University, Rawalpindi 46300, Pakistan
| | - Mazhar Qayyum
- Department of Zoology, PMAS Arid Agriculture University, Rawalpindi 46300, Pakistan
| | - Figen Celik
- Department of Parasitology, Faculty of Veterinary Medicine, University of Firat, 23119 Elazig, Turkey
| | - Sami Simsek
- Department of Parasitology, Faculty of Veterinary Medicine, University of Firat, 23119 Elazig, Turkey
| | - Faheem Ahmad
- Department of Biosciences, COMSTS University Islamabad (CUI), Islamabad 46400, Pakistan
| | - Xiaocheng Zhang
- Key Laboratory of Parasite and Vector Biology, National Health Commission of the People's Republic of China, Shanghai 200025, China
- National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention (Chinese Center for Tropical Diseases Research), Shanghai 200025, China
- World Health Organization Collaborating Center for Tropical Diseases, Shanghai 200025, China
| | - Haroon Ahmed
- Department of Biosciences, COMSTS University Islamabad (CUI), Islamabad 46400, Pakistan
| | - Jianping Cao
- Key Laboratory of Parasite and Vector Biology, National Health Commission of the People's Republic of China, Shanghai 200025, China
- National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention (Chinese Center for Tropical Diseases Research), Shanghai 200025, China
- World Health Organization Collaborating Center for Tropical Diseases, Shanghai 200025, China
- The School of Global Health, Chinese Center for Tropical Diseases Research, Shanghai Jiao Tong University School of Medicine, Shanghai 200024, China
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10
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Shen Z, Qiu W, Luan H, Sun C, Cao X, Wang G, Peng J. I329L protein-based indirect ELISA for detecting antibodies specific to African swine fever virus. Front Cell Infect Microbiol 2023; 13:1150042. [PMID: 37351180 PMCID: PMC10282770 DOI: 10.3389/fcimb.2023.1150042] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Accepted: 05/23/2023] [Indexed: 06/24/2023] Open
Abstract
African swine fever (ASF) is a disease that causes severe economic losses to the global porcine industry. As no vaccine or drug has been discovered for the prevention and control of ASF virus (ASFV), accurate diagnosis and timely eradication of infected animals are the primary measures, which necessitate accurate and effective detection methods. In this study, the truncated ASFV I329L (amino acids 70-237), was induced using IPTG and expressed in Escherichia coli cells. The highly antigenic viral protein I329L was used to develop an indirect enzyme-linked immunosorbent assay (iELISA), named I329L-ELISA, which cut-off value was 0.384. I329L-ELISA was used to detect 186 clinical pig serum samples, and the coincidence rate between the indirect ELISA developed here and the commercial kit was 96.77%. No cross-reactivity was observed with CSFV, PRRSV, PCV2, or PRV antibody-positive pig sera, indicating good specificity. Both intra- assay and inter-assay coefficients were below 10%, and the detection sensitivity of the iELISA reached 1:3200. In this study, an iELISA for ASFV antibody detection was developed based on the truncated ASFV I329L protein. Overall, the I329L-ELISA is a user-friendly detection tool that is suitable for ASFV antibody detection and epidemiological surveillance.
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Affiliation(s)
- Zhiyong Shen
- College of Veterinary Medicine, Shandong Agricultural University, Tai’an, China
- Breeding Management Department, Beisanxia Husbandry Company Limited, Hegang, China
| | - Wenchen Qiu
- College of Veterinary Medicine, Shandong Agricultural University, Tai’an, China
| | - Haorui Luan
- College of Veterinary Medicine, Shandong Agricultural University, Tai’an, China
| | - Chunxi Sun
- College of Veterinary Medicine, Shandong Agricultural University, Tai’an, China
| | - Xinya Cao
- College of Veterinary Medicine, Shandong Agricultural University, Tai’an, China
| | - Gang Wang
- College of Veterinary Medicine, Shandong Agricultural University, Tai’an, China
- Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Agricultural University, Tai’an, China
| | - Jun Peng
- College of Veterinary Medicine, Shandong Agricultural University, Tai’an, China
- Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Agricultural University, Tai’an, China
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11
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Marzok M, Al-Jabr OA, Salem M, Alkashif K, Sayed-Ahmed M, Wakid MH, Kandeel M, Selim A. Seroprevalence and Risk Factors for Toxoplasma gondii Infection in Horses. Vet Sci 2023; 10:vetsci10030237. [PMID: 36977276 PMCID: PMC10057672 DOI: 10.3390/vetsci10030237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Revised: 03/14/2023] [Accepted: 03/16/2023] [Indexed: 03/30/2023] Open
Abstract
BACKGROUND Toxoplasma gondii is classified as intracellular protozoa and is one of the major zoonotic parasites. Most warm-blooded intermediate hosts, including humans, are commonly infected by this parasite. The epidemiology of T. gondii infection in Egyptian horses is currently poorly understood. METHODS 420 blood samples were randomly collected from horses raised in four governorates in Northern Egypt (110 each from Giza and Kafr El Sheikh, and 100 each from Qalyubia and Gharbia) to investigate the existence of antibodies against T. gondii using a commercial ELISA kit, and to ascertain the risk factors for the infection. RESULTS the antibodies for T. gondii were found in 16.2% (68/420) of the examined horses, with no significant differences among the four studied governorates. The highest prevalence rate was observed in Giza. The results revealed that sex, breed, age, and contact with domestic ruminants or cats were recognized as potential risk factors. The high prevalence rate was found in mixed breed horses (OR = 2.63, 95% CI: 0.95-7.26), mares (OR = 2.35, 95% CI: 1.31-4.19), and horses aged over 10 years (OR = 2.78, 95% CI: 1.30-3.44). Moreover, the likelihood of seropositivity for T. gondii infection was higher in horses raised in environments with cats (OR = 1.97, 95% CI: 1.13-3.44, p = 0.017) or domestic ruminants (OR = 2.16, 1.21-3.86, p = 0.010). This report confirms that horses in Northern Egypt are exposed to T. gondii and thus raises the possibility that people and other animals could contract the disease. CONCLUSIONS routine examination and management of T. gondii infection in horses in these governorates is advised.
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Affiliation(s)
- Mohamed Marzok
- Department of Clinical Sciences, College of Veterinary Medicine, King Faisal University, Al-Hofuf 31982, Saudi Arabia
- Department of Surgery, Faculty of Veterinary Medicine, Kafr El Sheikh University, Kafr El Sheikh 33511, Egypt
- King Faisal University Veterinary Hospital, Al-Asha 31982, Saudi Arabia
| | - Omar A Al-Jabr
- Department of Microbiology, College of Veterinary Medicine, King Faisal University, Al-Asha 31982, Saudi Arabia
| | - Mohamed Salem
- Department of Clinical Sciences, College of Veterinary Medicine, King Faisal University, Al-Hofuf 31982, Saudi Arabia
- King Faisal University Veterinary Hospital, Al-Asha 31982, Saudi Arabia
- Department of Medicine and Infectious Diseases, Faculty of Veterinary Medicine, Cairo University, Cairo 12613, Egypt
| | - Khalid Alkashif
- Department of Pharmacology and Toxicology, College of Pharmacy, Jazan University, Jazan 82722, Saudi Arabia
| | - Mohamed Sayed-Ahmed
- Department of Clinical Pharmacy, College of Pharmacy, Jazan University, Jazan 82722, Saudi Arabia
- Department of Internal Medicine and Infectious Diseases, Faculty of Veterinary Medicine, Mansoura University, Mansoura 35516, Egypt
| | - Majed H Wakid
- Department of Medical Laboratory Technology, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah 21589, Saudi Arabia
- Special Infectious Agents Unit, King Fahd Medical Research Center, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Mahmoud Kandeel
- Department of Pharmacology, Faculty of Veterinary Medicine, Kafr El Sheikh University, Kafr El Sheikh 33511, Egypt
- Department of Biomedical Sciences, College of Veterinary Medicine, King Faisal University, Al-Ahsa 31982, Saudi Arabia
| | - Abdelfattah Selim
- Department of Animal Medicine (Infectious Diseases), Faculty of Veterinary Medicine, Benha University, Toukh 13736, Egypt
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12
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Dong N, Wang Z, Sun Q, Chen X, Zhang H, Zheng J, Zhang X, Qiu Y, Li Z, Li B, Liu K, Shao D, Wei J, Sun J, Ma Z. Establishment and Application of an Indirect ELISA for the Detection of Antibodies to Porcine Streptococcus suis Based on a Recombinant GMD Protein. Animals (Basel) 2023; 13. [PMID: 36830506 DOI: 10.3390/ani13040719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 02/07/2023] [Accepted: 02/07/2023] [Indexed: 02/22/2023] Open
Abstract
S. suis is an important zoonotic pathogen from sick and recessive carrier pigs that poses a serious threat to animal husbandry production and public health. It usually causes horizontal transmission among pigs. The morbidity and mortality of this disease are very high. Human infection is caused through direct or indirect contact with sick pigs. The two large-scale outbreaks in China were due to the outbreak of S. suis on pig farms, which spread to human infection; thus, detecting S. suis in pig herds is crucial. At present, the commercial S. suis ELISA type 2 kits on the market can only detect single serotypes, high probabilities of interaction reactions, and biosafety risks when using inactivated S. suis as an antigen. Phosphate-3-glyceraldehyde dehydrogenase (GAPDH), muramidase-released protein (MRP), and dihydrolipoamide dehydrogenase (DLDH) are important S. suis type 2, S. suis type 7, and S. suis type 9 protective antigens. This study purified the GMD protein (B-cell-dominant epitopes of GAPDH, MRP, and DLDH antigens) and used a diverse combination of dominant epitopes of the multiple different antigens as coated antigens, improving the sensitivity and safety of the indirect ELISA experiments. An indirect ELISA method (GMD-ELISA) was developed for detecting S. suis antibodies. The antigen-antibody response was optimized using checkerboard titration. The results of testing using ELISA for Salmonella enterica (S. enterica), Escherichia coli (E. coli), Staphylococcus aureus (SA), and Streptococcus pyogenes (S. pyogenes) were all negative, indicating that this method had strong specificity. The results were still positive when the dilution ratio of S. suis-positive serum reached 1:6, 400, thus indicating that the method had high sensitivity. The results of the reproducibility assay for indirect ELISA showed that the intra-assay coefficient of variation and the inter-assay coefficient of variation were less than 10%, indicating that the method had good repeatability. We investigated the seroprevalence of S. suis in 167 serum samples collected in East China, and 33.5% of the samples were positive for antibodies against S. suis, indicating that the prevalence of S. suis is high in pig farms in Eastern China. The novel GMD-ELISA is a convenient, sensitive, and specific diagnostic method that provides technical support for rapid diagnosis and epidemiological investigation.
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13
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Li J, Jiao J, Liu N, Ren S, Zeng H, Peng J, Zhang Y, Guo L, Liu F, Lv T, Chen Z, Sun W, Hrabchenko N, Yu J, Wu J. Novel p22 and p30 dual-proteins combination based indirect ELISA for detecting antibodies against African swine fever virus. Front Vet Sci 2023; 10:1093440. [PMID: 36846265 PMCID: PMC9950402 DOI: 10.3389/fvets.2023.1093440] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Accepted: 01/27/2023] [Indexed: 02/12/2023] Open
Abstract
Introduction African swine fever virus (ASFV) infection is one of the most complex and fatal hemorrhagic viral diseases, causing a devastating loss to the swine industry. Since no effective vaccine is available, prevention and control of ASFV heavily depends on early diagnostic detection. Methods In this study, a novel indirect ELISA was established for detecting antibodies against ASFV using dual-proteins, p22 and p30. Recombinants p22 and p30 were expressed and purified from E.coli vector system by recombined plasmids pET-KP177R and pET-CP204L. p22 and p30 were mixed as antigens for developing the indirect ELISA. Results Through optimizing coating concentrations of p30 and p22, coating ratio (p30: p22 = 1:3), and serum dilution (as 1:600), the established ELISA performed higher specificity, sensitivity, and repeatability against ASFV-positive serum. Furthermore, 184 clinical serum samples from suspected diseased pigs were verified the established ELISA in clinical diagnosis. The results showed that compared with two commercial ELISA kits, the established ELISA possessed higher sensitivity and almost uniform coincidence rate. Conclusion The novel indirect ELISA based on dual-proteins p30 and p22 performed a valuable role in diagnostic detection of ASFV, providing a broad insight into serological diagnostic methods of ASFV.
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Affiliation(s)
- Jianda Li
- Shandong Key Laboratory of Animal Disease Control and Breeding, Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Jinan, China
| | - Jian Jiao
- Shandong Key Laboratory of Animal Disease Control and Breeding, Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Jinan, China,School of Veterinary Medicine, Qingdao Agricultural University, Qingdao, China
| | - Na Liu
- Shandong Key Laboratory of Animal Disease Control and Breeding, Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Jinan, China,School of Life Sciences, Shandong Normal University, Jinan, China
| | - Sufang Ren
- Shandong Key Laboratory of Animal Disease Control and Breeding, Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Jinan, China
| | - Hao Zeng
- Shandong Key Laboratory of Animal Disease Control and Breeding, Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Jinan, China
| | - Jun Peng
- College of Animal Science and Technology, Shandong Agricultural University, Tai'an, China
| | - Yuyu Zhang
- Shandong Key Laboratory of Animal Disease Control and Breeding, Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Jinan, China,School of Life Sciences, Shandong Normal University, Jinan, China
| | - Lihui Guo
- Shandong Key Laboratory of Animal Disease Control and Breeding, Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Jinan, China
| | - Fei Liu
- Shandong Key Laboratory of Animal Disease Control and Breeding, Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Jinan, China
| | - Tingting Lv
- Shandong Key Laboratory of Animal Disease Control and Breeding, Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Jinan, China,School of Life Sciences, Shandong Normal University, Jinan, China
| | - Zhi Chen
- Shandong Key Laboratory of Animal Disease Control and Breeding, Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Jinan, China
| | - Wenbo Sun
- Shandong Key Laboratory of Animal Disease Control and Breeding, Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Jinan, China
| | - Nataliia Hrabchenko
- Shandong Key Laboratory of Animal Disease Control and Breeding, Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Jinan, China
| | - Jiang Yu
- Shandong Key Laboratory of Animal Disease Control and Breeding, Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Jinan, China,School of Veterinary Medicine, Qingdao Agricultural University, Qingdao, China,Jiang Yu ✉
| | - Jiaqiang Wu
- Shandong Key Laboratory of Animal Disease Control and Breeding, Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Jinan, China,School of Veterinary Medicine, Qingdao Agricultural University, Qingdao, China,School of Life Sciences, Shandong Normal University, Jinan, China,*Correspondence: Jiaqiang Wu ✉
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14
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Gao D, Yu J, Dai X, Tian Y, Sun J, Xu X, Cai X. Development and evaluation of an indirect enzyme-linked immunosorbent assay based on a recombinant SifA protein to detect Salmonella infection in poultry. Poult Sci 2023; 102:102513. [PMID: 36805395 DOI: 10.1016/j.psj.2023.102513] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 01/12/2023] [Accepted: 01/13/2023] [Indexed: 01/22/2023] Open
Abstract
Salmonella is an important zoonotic pathogen that not only endangers food safety and human health, but also causes considerable economic losses to the poultry industry. Therefore, it is essential to establish a rapid, sensitive, and specific diagnostic method for the early detection of Salmonella infection in poultry. In this study, we developed a novel enzyme-linked immunosorbent assay (ELISA) for the detection of anti-Salmonella antibodies using a recombinant SifA protein. Amino acid sequence comparison revealed that SifA is a relatively conserved secretory protein across Salmonella serotypes. Therefore, we hypothesized that SifA can serve as a detection antigen for diagnostic testing. The SifA protein was expressed in Escherichia coli and used as a coating antigen to establish an SifA-ELISA. Control sera from specific-pathogen-free (SPF) chickens infected with Salmonella or several other non-Salmonella pathogens were then tested using the SifA-ELISA. Specificity testing demonstrated that the SifA-ELISA could detect antibodies against 3 different serotypes of Salmonella, whereas antibodies against other non-Salmonella pathogens could not be detected. Compared to the SifA-ELISA, the Salmonella plate agglutination test (PAT) failed to detect antibodies in serum samples from chickens infected with Salmonella Typhimurium. This result suggests that our SifA-ELISA may be better than PAT at detecting Salmonella infection. Comparing clinical sera, we observed a similar rate of Salmonella positivity between SifA-ELISA and PAT (92.6%). In addition, anti-SifA antibodies were continuously detected during Salmonella infection of SPF chickens, demonstrating that SifA-ELISA could consistently detect high levels of antibodies for at least 8 wk. Furthermore, the intra-assay and interassay coefficients of variation (CV) of the SifA-ELISA were below 10%, which is considered acceptable. In summary, the SifA-ELISA established here is a promising and reliable method for detection of anti-Salmonella antibodies in poultry and may contribute to the early diagnosis of Salmonella infection.
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15
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Li L, Qiao S, Liu J, Zhou Y, Tong W, Dong S, Liu C, Jiang Y, Guo Z, Zheng H, Zhao R, Tong G, Li G, Gao F. A highly efficient indirect ELISA and monoclonal antibody established against African swine fever virus pK205R. Front Immunol 2023; 13:1103166. [PMID: 36700212 PMCID: PMC9868132 DOI: 10.3389/fimmu.2022.1103166] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2022] [Accepted: 12/21/2022] [Indexed: 01/11/2023] Open
Abstract
African swine fever (ASF) is a contagious infectious disease with high lethality which continuously threatens the global pig industry causing huge economic losses. Currently, there are no commercially available vaccines or antiviral drugs that can effectively control ASF. The pathogen of ASF, ASF virus (ASFV) is a double-stranded DNA virus with a genome ranging from 170 to 193 kb and 151 to 167 open reading frames in various strains, which encodes 150-200 proteins. An effective method of monitoring ASFV antibodies, and specific antibodies against ASFV to promote the development of prevention techniques are urgently needed. In the present study, pK205R of ASFV was successfully expressed in mammalian cells using a suspension culture system. An indirect enzyme-linked immunosorbent assay (ELISA) based on the purified pK205R was established and optimized. The monoclonal antibody (mAb) against pK205R recognized a conservative linear epitope (2VEPREQFFQDLLSAV16) and exhibited specific reactivity, which was conducive to the identification of the recombinant porcine reproductive and respiratory syndrome virus (PRRSV) expressing pK205R. The ELISA method efficiently detected clinical ASFV infection and revealed good application prospects in monitoring the antibody level in vivo for recombinant PRRSV live vector virus expressing the ASFV antigen protein. The determination of the conserved linear epitope of pK205R would contribute to further research on the structural biology and function of pK205R. The indirect ELISA method and mAb against ASFV pK205R revealed efficient detection and promising application prospects, making them ideal for epidemiological surveillance and vaccine research on ASF.
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Affiliation(s)
- Liwei Li
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China
| | - Sina Qiao
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China,College of Veterinary Medicine, Hebei Agricultural University, Baoding, China
| | - Jiachen Liu
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China
| | - Yanjun Zhou
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China
| | - Wu Tong
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China
| | - Shishan Dong
- College of Veterinary Medicine, Hebei Agricultural University, Baoding, China
| | - Changlong Liu
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China
| | - Yifeng Jiang
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China
| | - Ziqiang Guo
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China
| | - Haihong Zheng
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China
| | - Ran Zhao
- Xiamen Center for Animal Disease Control and Prevention, Xiamen, China
| | - Guangzhi Tong
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China
| | - Guoxin Li
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China,Jiangsu Co-Innovation Center for the Prevention and Control of Important Animal Infectious Disease and Zoonose, Yangzhou University, Yangzhou, China,*Correspondence: Guoxin Li, ; Fei Gao,
| | - Fei Gao
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China,Jiangsu Co-Innovation Center for the Prevention and Control of Important Animal Infectious Disease and Zoonose, Yangzhou University, Yangzhou, China,*Correspondence: Guoxin Li, ; Fei Gao,
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16
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Li L, Qiao S, Li G, Tong W, Dong S, Liu J, Guo Z, Zheng H, Zhao R, Tong G, Zhou Y, Gao F. The Indirect ELISA and Monoclonal Antibody against African Swine Fever Virus p17 Revealed Efficient Detection and Application Prospects. Viruses 2022; 15:50. [PMID: 36680090 PMCID: PMC9865993 DOI: 10.3390/v15010050] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Revised: 12/20/2022] [Accepted: 12/21/2022] [Indexed: 12/28/2022] Open
Abstract
Since 2018, the outbreak and prevalence of the African swine fever virus (ASFV) in China have caused huge economic losses. Less virulent ASFVs emerged in 2020, which led to difficulties and challenges for early diagnosis and control of African swine fever (ASF) in China. An effective method of monitoring ASFV antibodies and specific antibodies against ASFV to promote the development of prevention techniques are urgently needed. In the present study, ASFV p17 was successfully expressed in CHO cells using a suspension culture system. An indirect enzyme-linked immunosorbent assay (ELISA) based on purified p17 was established and optimized. The monoclonal antibody (mAb) against p17 recognized a conservative linear epitope (3TETSPLLSH11) and exhibited specific reactivity, which was conducive to the identification of recombinant porcine reproductive and respiratory syndrome virus (PRRSV) expressing p17. The ELISA method efficiently detected clinical ASFV infection and effectively monitored the antibody levels in vivo after recombinant PRRSV live vector virus expressing p17 vaccination. Overall, the determination of the conserved linear epitope of p17 would contribute to the in-depth exploration of the biological function of the ASFV antigen protein. The indirect ELISA method and mAb against ASFV p17 revealed efficient detection and promising application prospects, making them ideal for epidemiological surveillance and vaccine research on ASF.
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Affiliation(s)
- Liwei Li
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China
| | - Sina Qiao
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China
- College of Veterinary Medicine, Hebei Agricultural University, Baoding 071001, China
| | - Guoxin Li
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China
| | - Wu Tong
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China
| | - Shishan Dong
- College of Veterinary Medicine, Hebei Agricultural University, Baoding 071001, China
| | - Jiachen Liu
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China
| | - Ziqiang Guo
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China
| | - Haihong Zheng
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China
| | - Ran Zhao
- Xiamen Center for Animal Disease Control and Prevention, Xiamen 361009, China
| | - Guangzhi Tong
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China
| | - Yanjun Zhou
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China
- Jiangsu Co-Innovation Center for the Prevention and Control of Important Animal Infectious Disease and Zoonosis, Yangzhou University, Yangzhou 225009, China
| | - Fei Gao
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China
- Jiangsu Co-Innovation Center for the Prevention and Control of Important Animal Infectious Disease and Zoonosis, Yangzhou University, Yangzhou 225009, China
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17
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Shao H, Li J, Zhang J, Zhang Q, Ma L, Lu J, Li T, Xie Q, Wan Z, Qin A, Ye J. Research Note: A novel peptide-based ELISA for efficient detection of antibody against chicken infectious anemia virus. Poult Sci 2022; 102:102284. [PMID: 36399931 PMCID: PMC9673107 DOI: 10.1016/j.psj.2022.102284] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Revised: 10/13/2022] [Accepted: 10/19/2022] [Indexed: 11/15/2022] Open
Abstract
Chicken infectious anemia virus (CIAV) is the pathogen of chicken infectious anemia. Currently, due to the lack of effective diagnostics technology and prevention approach, CIAV has spread globally and caused huge economic losses to poultry industry. In this study, a novel peptide-based ELISA (pELISA) for efficient detection of antibody against CIAV was developed. The peptide (25CRLRRRYKFRHRRRQRYRRRAF45) used in pELISA was highly conserved in VP1 protein of different CIAV isolates. The specificity and reproducibility showed that the pELISA only reacted with sera against CIAV, not with sera against other pathogens tested, and the CV of the intra-/inter-assay of the pELISA was 6.8 to 9.22%. Moreover, the comparison assay using 56 clinical samples showed that the positive rate of the pELISA and the commercial ELISA kit (IDEXX) was 85.7 and 80.4%, respectively. The pELISA generated here provides a rapid and efficient serological detection method for diagnosis of CIAV infection and evaluation of the efficacy of CIAV vaccination.
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Affiliation(s)
- Hongxia Shao
- Key Laboratory of Jiangsu Preventive Veterinary Medicine, Key Laboratory for Avian Preventive Medicine, Ministry of Education, College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China 225009,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, China 225009,Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University, Yangzhou, Jiangsu, China 225009,Institutes of Agricultural Science and Technology Development, Yangzhou University, Yangzhou, Jiangsu, China 225009
| | - Jinzhi Li
- Key Laboratory of Jiangsu Preventive Veterinary Medicine, Key Laboratory for Avian Preventive Medicine, Ministry of Education, College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China 225009,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, China 225009,Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University, Yangzhou, Jiangsu, China 225009,Institutes of Agricultural Science and Technology Development, Yangzhou University, Yangzhou, Jiangsu, China 225009
| | - Jun Zhang
- Key Laboratory of Jiangsu Preventive Veterinary Medicine, Key Laboratory for Avian Preventive Medicine, Ministry of Education, College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China 225009,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, China 225009,Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University, Yangzhou, Jiangsu, China 225009
| | - Qi Zhang
- Wens Foodstuff Group Co., Ltd, Yunfu, Guangdong, China 527400
| | - Li Ma
- Key Laboratory of Jiangsu Preventive Veterinary Medicine, Key Laboratory for Avian Preventive Medicine, Ministry of Education, College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China 225009,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, China 225009,Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University, Yangzhou, Jiangsu, China 225009,Institutes of Agricultural Science and Technology Development, Yangzhou University, Yangzhou, Jiangsu, China 225009
| | - Jinhua Lu
- Wens Foodstuff Group Co., Ltd, Yunfu, Guangdong, China 527400
| | - Tuofan Li
- Key Laboratory of Jiangsu Preventive Veterinary Medicine, Key Laboratory for Avian Preventive Medicine, Ministry of Education, College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China 225009,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, China 225009,Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University, Yangzhou, Jiangsu, China 225009,Institutes of Agricultural Science and Technology Development, Yangzhou University, Yangzhou, Jiangsu, China 225009
| | - Quan Xie
- Key Laboratory of Jiangsu Preventive Veterinary Medicine, Key Laboratory for Avian Preventive Medicine, Ministry of Education, College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China 225009,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, China 225009,Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University, Yangzhou, Jiangsu, China 225009,Institutes of Agricultural Science and Technology Development, Yangzhou University, Yangzhou, Jiangsu, China 225009
| | - Zhimin Wan
- Key Laboratory of Jiangsu Preventive Veterinary Medicine, Key Laboratory for Avian Preventive Medicine, Ministry of Education, College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China 225009,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, China 225009,Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University, Yangzhou, Jiangsu, China 225009,Institutes of Agricultural Science and Technology Development, Yangzhou University, Yangzhou, Jiangsu, China 225009
| | - Aijian Qin
- Key Laboratory of Jiangsu Preventive Veterinary Medicine, Key Laboratory for Avian Preventive Medicine, Ministry of Education, College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China 225009,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, China 225009,Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University, Yangzhou, Jiangsu, China 225009,Institutes of Agricultural Science and Technology Development, Yangzhou University, Yangzhou, Jiangsu, China 225009
| | - Jianqiang Ye
- Key Laboratory of Jiangsu Preventive Veterinary Medicine, Key Laboratory for Avian Preventive Medicine, Ministry of Education, College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China 225009,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, China 225009,Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University, Yangzhou, Jiangsu, China 225009,Institutes of Agricultural Science and Technology Development, Yangzhou University, Yangzhou, Jiangsu, China 225009,Corresponding author:
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Wang L, Fu D, Tesfagaber W, Li F, Chen W, Zhu Y, Sun E, Wang W, He X, Guo Y, Bu Z, Zhao D. Development of an ELISA Method to Differentiate Animals Infected with Wild-Type African Swine Fever Viruses and Attenuated HLJ/18-7GD Vaccine Candidate. Viruses 2022; 14:v14081731. [PMID: 36016353 PMCID: PMC9415487 DOI: 10.3390/v14081731] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 07/30/2022] [Accepted: 08/03/2022] [Indexed: 11/16/2022] Open
Abstract
African swine fever (ASF) is a highly contagious hemorrhagic disease of pigs, posing a significant threat to the world pig industry. Several researchers are investigating the possibilities for developing a safe and efficient vaccine against ASF. In this regard, significant progress has been made and some gene-deleted ASFVs are reported as potential live attenuated vaccines. A seven-gene-deleted live attenuated vaccine candidate HLJ/18-7GD (among which CD2v is included) has been developed in our laboratory and reported to be safe and protective, and it is expected to be commercialized in the near future. There is an urgent need for developing a diagnostic method that can clearly discriminate between wild-type-ASFV-infected and vaccinated animals (DIVA). In the present study, a dual indirect ELISA based on p54 and CD2v proteins was successfully established to specifically distinguish serum antibodies from pigs infected with wild-type ASFV or possessing vaccine immunization. To evaluate the performance of the assay, a total of 433 serum samples from four groups of pigs experimentally infected with the wild-type HLJ/18 ASFV, immunized with the HLJ/18-7GD vaccine candidate, infected with the new lower virulent variant, and specific-pathogen-free pigs were used. Our results showed that the positive rate of immunized serum was 96.54% (p54) and 2.83% (CD2v), and the positive rate of the infection by wild-type virus was 100% (p54) and 97.8% (CD2v). Similarly, the positive rate to infection by the new low-virulent ASFV variant in China was 100% (p54) and 0% (CD2v), indicating the technique was also able to distinguish antibodies from wild-type and the new low-virulent ASFV variant in China. Moreover, no cross-reaction was observed in immune sera from other swine pathogens, such as CSFV, PEDV, PRRSV, HP-PRRSV, PCV2, and PrV. Overall, the developed dual indirect ELISA exhibited high diagnostic sensitivity, specificity, and repeatability and will provide a new approach to differentiate serum antibodies between wild virulent and CD2v-unexpressed ASFV infection, which will play a great role in serological diagnosis and epidemiological monitoring of ASF in the future.
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Affiliation(s)
- Lulu Wang
- State Key Laboratory of Veterinary Biotechnology, National High Containment Facilities for Animal Diseases Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150069, China
- State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Nankai University, Tianjin 300350, China
| | - Dan Fu
- State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Nankai University, Tianjin 300350, China
| | - Weldu Tesfagaber
- State Key Laboratory of Veterinary Biotechnology, National High Containment Facilities for Animal Diseases Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150069, China
| | - Fang Li
- State Key Laboratory of Veterinary Biotechnology, National High Containment Facilities for Animal Diseases Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150069, China
| | - Weiye Chen
- State Key Laboratory of Veterinary Biotechnology, National High Containment Facilities for Animal Diseases Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150069, China
| | - Yuanmao Zhu
- State Key Laboratory of Veterinary Biotechnology, National High Containment Facilities for Animal Diseases Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150069, China
| | - Encheng Sun
- State Key Laboratory of Veterinary Biotechnology, National High Containment Facilities for Animal Diseases Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150069, China
| | - Wan Wang
- State Key Laboratory of Veterinary Biotechnology, National High Containment Facilities for Animal Diseases Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150069, China
| | - Xijun He
- State Key Laboratory of Veterinary Biotechnology, National High Containment Facilities for Animal Diseases Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150069, China
| | - Yu Guo
- State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Nankai University, Tianjin 300350, China
- Correspondence: (Y.G.); (Z.B.); (D.Z.)
| | - Zhigao Bu
- State Key Laboratory of Veterinary Biotechnology, National High Containment Facilities for Animal Diseases Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150069, China
- Correspondence: (Y.G.); (Z.B.); (D.Z.)
| | - Dongming Zhao
- State Key Laboratory of Veterinary Biotechnology, National High Containment Facilities for Animal Diseases Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150069, China
- Correspondence: (Y.G.); (Z.B.); (D.Z.)
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Aruna GL, Ramalingappa B. Development of Indirect ELISA and its evaluation in Comparison with KOH hydrolysis and Fungal culture for the immuno diagnosis of Trichophyton rubrum and Trichophyton mentagrophytes infection in Humans. Acta Trop 2022;:106590. [PMID: 35907501 DOI: 10.1016/j.actatropica.2022.106590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 06/25/2022] [Accepted: 07/05/2022] [Indexed: 11/24/2022]
Abstract
Trichophyton is a keratinophilic fungus that can invade keratinized tissues of humans and cause superficial mycoses called dermatophytosis. The objective of this study was to develop and evaluate indirect ELISA in comparison with gold standard methods such as direct microscopic examination of KOH mounts and fungal culture for the diagnosis of Trichophyton infection in humans. The present investigation reports the production and partial purification of T. rubrum mycelial antigens and production of specific polyclonal antibodies. It also reports the development and optimization of indirect ELISA and evaluation of its potential in comparison with gold standard methods for the diagnosis of Trichophyton infection in humans. The diagnostic sensitivity and specificity of Trichophyton indirect ELISA was 93.75% and 93.33 % respectively. The positive and negative predictive values were high as well, found to be 93.75% and 90.00% respectively indicating usefulness of the assay. In all comparisons, the correlation coefficient (r) value was >0.5 indicating strong correlation between KOH hydrolysis test, fungal culture method and indirect ELISA. A significant correlation coefficient of 0.856 (P < 0.0001) was obtained between indirect ELISA and fungal culture method. This shows a good agreement between fungal culture method and indirect ELISA. The present study clearly shows diagnostic performance of Trichophyton indirect ELISA developed in this study is efficient as fungal culture method for the diagnosis of Trichophyton infection in humans.
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20
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Farzaneh M, Derakhshandeh A, Al-Farha AABA, Petrovski K, Hemmatzadeh F. A novel phage-displayed MilA ELISA for detection of antibodies against Myc. bovis in bovine milk. J Appl Microbiol 2022; 133:1496-1505. [PMID: 35686656 PMCID: PMC9545076 DOI: 10.1111/jam.15655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Revised: 05/29/2022] [Accepted: 06/04/2022] [Indexed: 12/01/2022]
Abstract
AIMS The aim of this study was to assess a phage-displayed MilA protein of Myc. bovis in an indirect ELISA for the detection of Myc. bovis antibodies in milk samples. METHODS AND RESULTS The desired sequence of milA gene was synthesized and cloned into pCANTAB-F12 phagemid vector. The expression of the MilA on the phage surface was confirmed by Western blotting. The recombinant phage was used in the development of an indirect ELISA to detect Myc. bovis antibodies in milk samples. There was a significant agreement between the results of phage-based ELISA and recombinant GST-MilA ELISA for the detection of Myc. bovis antibodies in milk samples. CONCLUSIONS The inexpensive and convenient phage-based ELISA can be used instead of recombinant protein/peptide ELISA as an initial screening of Myc. bovis-associated mastitis. SIGNIFICANCE AND IMPACT OF STUDY Mastitis associated with Myc. bovis is a continuous and serious problem in the dairy industry. Sero-monitoring of Myc. bovis infection cases are one of the key factors for surveillance of the infections in dairy farms. Despite the existence of some commercially serological assays for Myc. bovis antibodies, they have some limitations regarding their sensitivity and availability. The development of accurate diagnosis tools could contribute to control programmes of Myc. bovis-associated mastitis in the dairy herds.
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Affiliation(s)
- Mina Farzaneh
- Department of Pathobiology, School of Veterinary Medicine, Shiraz University, Shiraz, Iran
| | - Abdollah Derakhshandeh
- Department of Pathobiology, School of Veterinary Medicine, Shiraz University, Shiraz, Iran
| | - Abd Al-Bar Ahmed Al-Farha
- Department of Animal Production, Technical Agricultural College, Northern Technical University, Mosul, Iraq
| | - Kiro Petrovski
- Australian Centre for Antimicrobial Resistance Ecology, The University of Adelaide, School of Animal and Veterinary Sciences, South Australia, Australia.,Davies Research Centre, School of Animal and Veterinary Sciences, The University of Adelaide, Adelaide, Australia
| | - Farhid Hemmatzadeh
- Davies Research Centre, School of Animal and Veterinary Sciences, The University of Adelaide, Adelaide, Australia.,School of Animal and Veterinary Sciences, The University of Adelaide, Adelaide, Australia
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21
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Suo B, He J, Wu C, Wang D. Comparison of Different Laboratory Methods for Clinical Detection of Brucella Infection. Bull Exp Biol Med 2021; 172:223-227. [PMID: 34853970 DOI: 10.1007/s10517-021-05367-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Indexed: 11/30/2022]
Abstract
The rapidity, accuracy, and detection abilities of different laboratory methods (tube agglutination test (SAT), indirect ELISA, fluorescence polarization test (FPA), and blood culture methods) to detect Brucella in the laboratory. The study included 95 patients with documented and 42 patients with suspected brucellosis and 56 healthy control subjects. For the tests, the positive rates of Brucella infection detection in the confirmed group were significantly higher than in group with suspected infection (p<0.01) and in healthy controls (p<0.01). There was no significant difference between indirect ELISA and FPA in detecting antibodies to Brucella in acute (χ2=0.335), subacute (χ2=0.660), and chronic cases (χ2=5.332). Among the detection methods, indirect ELISA showed the highest sensitivity (98.9%), specificity (100%), and Youden index (0.989). The sensitivity and specificity of FPA were 96.8 and 96.4%, respectively. In order to easily and rapidly diagnose brucellosis in clinical practice, a combination of detection methods is recommended, in which Brucella antibodies are screened by FPA and then confirmed by indirect ELISA.
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Affiliation(s)
- B Suo
- Scientific Research Department, Clinical Laboratory of General Hospital of Heilongjiang Province Land Reclamation Bureau, Harbin, China
| | - J He
- Clinical Laboratory of General Hospital of Heilongjiang Province Land Reclamation Bureau, Harbin, China
| | - C Wu
- Clinical Laboratory of General Hospital of Heilongjiang Province Land Reclamation Bureau, Harbin, China
| | - D Wang
- Scientific Research Department, Clinical Laboratory of General Hospital of Heilongjiang Province Land Reclamation Bureau, Harbin, China.
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22
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Mamo T, Yimer L. Serological Investigation of Newcastle Disease in Selected Districts of Buno Bedelle Zone, Ethiopia. Vet Med (Auckl) 2021; 12:253-259. [PMID: 34616667 PMCID: PMC8488029 DOI: 10.2147/vmrr.s327892] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Accepted: 09/21/2021] [Indexed: 12/29/2022]
Abstract
Purpose Newcastle disease causes considerable loss in the poultry industry worldwide and its outbreaks are regularly reported from all continents of the world, including Ethiopia. The investigation was conducted from October 2020 to June 2021 to determine the prevalence of Newcastle disease (ND) in districts selected from Buno Bedele zone, Western Oromia. Methods The study design used was a cross-sectional type. For this study, a total of 480 serum samples were collected as per sample collection guideline from randomly selected chickens that were apparently healthy and had no history of vaccination against Newcastle disease. Indirect ELISA was performed and all data were analyzed using SPSS statistical software. Results From serological investigation, overall seroprevalence of Newcastle disease was 30%. Seroprevalence of Newcastle disease was 34.94%, 22.22%, and 31.76% in Didessa, Chora, and Gachi districts, respectively. Among computed risk factors, breed showed statistically significant difference and the odds of infection were lower in adult than in young chickens. Similarly, the odds of infection with Newcastle disease virus were significantly higher in crossbred than in locally bred backyard chickens. Conclusion This study revealed Newcastle disease was prevalent in the study areas; therefore, regular investigation of Newcastle disease should be conducted along with detailed studies on molecular characterization of circulating field strains in the area.
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Affiliation(s)
- Tamirat Mamo
- Seyo District Livestock Development Office, Dembi Dollo, Ethiopia
| | - Lama Yimer
- School of Veterinary Medicine, Wollega University, Nekemte, Ethiopia
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23
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Richards CA, Abdel-Latif HMR, Loch TP, Faisal M. HIGH PREVALENCE OF CIRCULATING ANTIBODIES TO RENIBACTERIUM SALMONINARUM IN SPAWNING ONCORHYNCHUS SPP. FROM LAKE MICHIGAN, USA. J Wildl Dis 2021; 57:19-26. [PMID: 33635967 DOI: 10.7589/2019-04-098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Accepted: 12/11/2019] [Indexed: 11/20/2022]
Abstract
Bacterial kidney disease, caused by Renibacterium salmoninarum, threatens salmonids worldwide. Following devastating mortality episodes in Oncorhynchus spp. in Lake Michigan, US, in the 1980s and infection rates >90%, pathogen prevalence has steadily declined to <5% over three decades in the three state-managed stocks. In this study, we sought to determine if the declining infection rates were associated with heightened circulating antibodies in state-managed Oncorhynchus spp. residing in the Lake Michigan watershed. A single-dilution, indirect enzyme-linked immunosorbent assay (ELISA) was modified to detect circulating antibodies against R. salmoninarum. Baseline values were delineated from naive chinook salmon (Oncorhynchus tshawytscha) and rainbow trout (Oncorhynchus mykiss). The assay was first used to assess primary antibody production over a 4-wk period in chinook salmon experimentally infected with R. salmoninarum. Mean antibody response was detected as early as 2 wk postinfection and continued to increase to the end of the observation period. The modified ELISA was then used to detect antibodies in serum samples collected from feral adult chinook salmon, coho salmon (Oncorhynchus kisutch), and steelhead trout (O. mykiss) returning to spawn at Lake Michigan weirs in 2009 and 2013. Results demonstrated that about 80% of feral Oncorhynchus spp. had measurable titers of circulating antibodies to R. salmoninarum. The relative ease and reasonable costs of this modified ELISA makes it a valuable serosurveillance tool for assessing the humoral immune status of feral salmonid populations.
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Mazziotta C, Lanzillotti C, Torreggiani E, Oton-Gonzalez L, Iaquinta MR, Mazzoni E, Gaboriaud P, Touzé A, Silvagni E, Govoni M, Martini F, Tognon M, Rotondo JC. Serum Antibodies Against the Oncogenic Merkel Cell Polyomavirus Detected by an Innovative Immunological Assay With Mimotopes in Healthy Subjects. Front Immunol 2021; 12:676627. [PMID: 34168646 PMCID: PMC8217635 DOI: 10.3389/fimmu.2021.676627] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Accepted: 05/20/2021] [Indexed: 12/22/2022] Open
Abstract
Merkel cell polyomavirus (MCPyV), a small DNA tumor virus, has been detected in Merkel cell carcinoma (MCC) and in normal tissues. Since MCPyV infection occurs in both MCC-affected patients and healthy subjects (HS), innovative immunoassays for detecting antibodies (abs) against MCPyV are required. Herein, sera from HS were analyzed with a novel indirect ELISA using two synthetic peptides mimicking MCPyV capsid protein epitopes of VP1 and VP2. Synthetic peptides were designed to recognize IgGs against MCPyV VP mimotopes using a computer-assisted approach. The assay was set up evaluating its performance in detecting IgGs anti-MCPyV on MCPyV-positive (n=65) and -negative (n=67) control sera. Then, the ELISA was extended to sera (n=548) from HS aged 18-65 yrs old. Age-specific MCPyV-seroprevalence was investigated. Performance evaluation indicated that the assay showed 80% sensitivity, 91% specificity and 83.9% accuracy, with positive and negative predictive values of 94.3% and 71%, respectively. The ratio expected/obtained data agreement was 86%, with a Cohen's kappa of 0.72. Receiver-operating characteristic (ROC) curves analysis indicated that the areas under the curves (AUCs) for the two peptides were 0.82 and 0.74, respectively. Intra-/inter-run variations were below 9%. The overall prevalence of serum IgGs anti-MCPyV in HS was 62.9% (345/548). Age-specific MCPyV-seroprevalence was 63.1% (82/130), 56.7% (68/120), 64.5% (91/141), and 66.2% (104/157) in HS aged 18-30, 31-40, 41-50 and 51-65 yrs old, respectively (p>0.05). Performance evaluation suggests that our indirect ELISA is reliable in detecting IgGs anti-MCPyV. Our immunological data indicate that MCPyV infection occurs asymptomatically, at a relatively high prevalence, in humans.
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Affiliation(s)
- Chiara Mazziotta
- Department of Medical Sciences, University of Ferrara, Ferrara, Italy
| | | | - Elena Torreggiani
- Department of Medical Sciences, University of Ferrara, Ferrara, Italy
| | | | | | - Elisa Mazzoni
- Department of Medical Sciences, University of Ferrara, Ferrara, Italy
| | - Pauline Gaboriaud
- ISP “Biologie des infections à polyomavirus” Team, UMR INRA 1282, University of Tours, Tours, France
| | - Antoine Touzé
- ISP “Biologie des infections à polyomavirus” Team, UMR INRA 1282, University of Tours, Tours, France
| | - Ettore Silvagni
- Department of Medical Sciences, University of Ferrara, Ferrara, Italy
| | - Marcello Govoni
- Department of Medical Sciences, University of Ferrara, Ferrara, Italy
| | - Fernanda Martini
- Department of Medical Sciences, University of Ferrara, Ferrara, Italy
| | - Mauro Tognon
- Department of Medical Sciences, University of Ferrara, Ferrara, Italy
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25
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Ding H, Wen Y, Xu Z, Zhou B, Tlili C, Tian Y, Wang Z, Ning Y, Xin J. Development of an ELISA for distinguishing convalescent sera with Mycoplasma hyopneumoniae infection from hyperimmune sera responses to bacterin vaccination in pigs. Vet Med Sci 2021; 7:1831-1840. [PMID: 34021737 PMCID: PMC8464267 DOI: 10.1002/vms3.539] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Revised: 04/30/2021] [Accepted: 05/03/2021] [Indexed: 12/16/2022] Open
Abstract
Vaccination with inactivated bacterin is the most popular and practical measure to control enzootic pneumonia. After immunisation with inactivated bacterin, Mycoplasma hyopneumoniae colonised on the respiratory tract and lung stimulates the humoural immune responses and produces IgG and IgA antibodies. ELISA is a widely used serological method to detect M. hyopneumoniae antibodies. However, commercial IgG‐ELISA kit cannot distinguish between inactivated bacterin‐induced hyperimmune sera and convalescent sera stimulated by natural infection. SIgA‐ELISA method needs to collect nasal swabs, but collecting nasal swabs is not easy to operate. Establishment of a discriminative ELISA detecting humoural IgG from convalescent sera but not hyperimmune sera facilitates to evaluate the natural infection of M. hyopneumoniae after inactivated bacterin vaccination. We expressed and purified a recombinant protein named Mhp366‐N which contains an epitope recognised by the convalescent sera but not hyperimmune sera. The developed discriminative IgG‐ELISA could discriminate between inactivated bacterin‐induced hyperimmune sera and convalescent sera and was reproducible, sensitive and specific to M. hyopneumoniae antibody produced by natural infection. Compared to SIgA‐ELISA method, discriminative IgG‐ELISA was more convenient to detect IgG antibody from sera than IgA from nasal swabs, although it has limited sensitivity in the early stages of infection. Additionally, to some extent, it has a potential to avoid the interference of maternally derived IgG antibodies. The established discriminative IgG‐ELISA was efficient to judge the serological IgG antibodies induced from natural infection or inactivated vaccine stimulation and provided a useful method to investigate and evaluate the live organism infection after the application of inactivated bacterin.
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Affiliation(s)
- Honglei Ding
- Laboratory of Veterinary Mycoplasmology, College of Veterinary Science, Southwest University, Chongqing, China.,Immunology Research Center, Medical Research Institute, Southwest University, Chongqing, China
| | - Yukang Wen
- Laboratory of Veterinary Mycoplasmology, College of Veterinary Science, Southwest University, Chongqing, China.,Immunology Research Center, Medical Research Institute, Southwest University, Chongqing, China
| | - Zuobo Xu
- Laboratory of Veterinary Mycoplasmology, College of Veterinary Science, Southwest University, Chongqing, China.,Immunology Research Center, Medical Research Institute, Southwest University, Chongqing, China
| | - Bingqian Zhou
- Laboratory of Veterinary Mycoplasmology, College of Veterinary Science, Southwest University, Chongqing, China.,Immunology Research Center, Medical Research Institute, Southwest University, Chongqing, China
| | - Chaker Tlili
- Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, China
| | - Yaqin Tian
- Laboratory of Veterinary Mycoplasmology, College of Veterinary Science, Southwest University, Chongqing, China.,Immunology Research Center, Medical Research Institute, Southwest University, Chongqing, China
| | - Zhaodi Wang
- Laboratory of Veterinary Mycoplasmology, College of Veterinary Science, Southwest University, Chongqing, China.,Immunology Research Center, Medical Research Institute, Southwest University, Chongqing, China
| | - Yaru Ning
- Laboratory of Veterinary Mycoplasmology, College of Veterinary Science, Southwest University, Chongqing, China.,Immunology Research Center, Medical Research Institute, Southwest University, Chongqing, China
| | - Jiuqing Xin
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
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Yuan Y, Yu L, Jin Z, Wang Y, Gao M, Ding H, Zhuo X, Zhu X, Gao F, Zheng X, Ying G, Xu X, Kong Q, Lu S, Lv H. Predictive Analysis of the Neutralization Activity in Convalescent Plasmas From COVID-19 Recovered Patients in Zhejiang Province, China, January-March, 2020. Front Cell Infect Microbiol 2021; 11:650487. [PMID: 33796489 PMCID: PMC8008148 DOI: 10.3389/fcimb.2021.650487] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Accepted: 02/19/2021] [Indexed: 12/23/2022] Open
Abstract
Background Convalescent plasma (CP) transfusion is considered to be the priority therapeutic option for COVID-19 inpatients when no specific drugs are available for emerging infections. An alternative, simple, and sensitive method is urgently needed for clinical use to detect neutralization activity of the CP to avoid the use of inconvenient micro-neutralization assay. Method This study aims to explore optimal index in predicting the COVID-19 CP neutralization activity (neutralizing antibody titers, NAb titers) in an indirect ELISA format. Fifty-seven COVID-19-recovered patients plasma samples were subjected to anti-SARS-CoV-2 RBD, S1, and N protein IgG antibody by indirect ELISA. Results ELISA-RBD exhibited high specificity (96.2%) and ELISA-N had high sensitivity (100%); while ELISA-S1 had low sensitivity (86.0%) and specificity (73.1%). Furthermore, ELISA-RBD IgG titers and pseudovirus-based NAb titers correlated significantly, with R2 of 0.2564 (P < 0.0001). Conclusion ELISA-RBD could be a substitute for the neutralization assay in resource-limited situations to screen potential plasma donors for further plasma infusion therapy.
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Affiliation(s)
- Yajie Yuan
- Institute of Parasitic Diseases, Hangzhou Medical College, Hangzhou, China.,School of Biological Engineering, Hangzhou Medical College, Hangzhou, China
| | - Liang Yu
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, National Medical Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
| | - Zi Jin
- Institute of Parasitic Diseases, Hangzhou Medical College, Hangzhou, China
| | - Yongjun Wang
- Blood Center of Zhejiang Province, Hangzhou, China
| | - Meng Gao
- Institute of Parasitic Diseases, Hangzhou Medical College, Hangzhou, China
| | - Haojie Ding
- Institute of Parasitic Diseases, Hangzhou Medical College, Hangzhou, China
| | - Xunhui Zhuo
- Institute of Parasitic Diseases, Hangzhou Medical College, Hangzhou, China
| | - Xiao Zhu
- Guangdong Key Laboratory for Research and Development of Natural Drugs, The Marine Biomedical Research Institute, Guangdong Medical University, Zhanjiang, China
| | - Fei Gao
- Department of research and development, Hangzhou AllTest Biotech Co., Ltd, Hangzhou, China
| | - Xiaojun Zheng
- Department of research and development, Hangzhou AllTest Biotech Co., Ltd, Hangzhou, China
| | - Guoqing Ying
- College of Pharmacy, Zhejiang University of Technology, Hangzhou, China
| | - Xiaowei Xu
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, National Medical Center for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
| | - Qingming Kong
- Institute of Parasitic Diseases, Hangzhou Medical College, Hangzhou, China.,School of Biological Engineering, Hangzhou Medical College, Hangzhou, China
| | - Shaohong Lu
- Institute of Parasitic Diseases, Hangzhou Medical College, Hangzhou, China
| | - Hangjun Lv
- Institute of Parasitic Diseases, Hangzhou Medical College, Hangzhou, China
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Ali MZ, Shaon MTW, Moula MM, Bary MA, Al Momen Sabuj A, Khaled SA, Bhuiyan ZA, Giasuddin M. First report on the seroprevalence of avian encephalomyelitis virus antibody in Sonali (cross-bred) chickens in Bogura, Bangladesh. J Adv Vet Anim Res 2021; 8:78-83. [PMID: 33860016 PMCID: PMC8043337 DOI: 10.5455/javar.2021.h488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2020] [Revised: 10/05/2020] [Accepted: 10/06/2020] [Indexed: 11/03/2022] Open
Abstract
Objectives The study intended to detect the presence and distribution of avian encephalomyelitis virus (AEV)-specific antibodies in Sonali (cross-bred) parent chickens regarding farm location, flock size, and age in Bogura district of Bangladesh, a Sonali chicken belt. Materials and methods A total of 275 Sonali parent chickens' blood samples were collected randomly from 39 flocks during laying age with a healthy and non-vaccination history against AEV. Blood samples were collected aseptically from the wing veins of chickens using 3-ml syringes and sera were separated. Then, the sera were transferred to the laboratory by maintaining a cool chain. Indirect enzyme-linked immunosorbent assay was used to detect the specific antibodies against AEV present in the sera samples. Results Overall, 70.18% of the chickens were found seropositive for AEV antibodies. Based on the location, the highest seropositivity was recorded in Bogura Sadar [91.30%, confidence intervals (CI) 79.21%-97.58%], and the lowest was in the Adomdighi sub-district (45.45%, CI 29.49%-63.08%). For flock size, AEV seropositivity was significantly (p < 0.05) higher in the large flock (82.22%, CI 72.74%-89.48%). Regarding age groups, the seropositivity of AEV was significantly (p < 0.05) increased with chickens' age. Higher seropositivity was noted in chickens aged >51 weeks (89.32%, CI 81.69%-94.55%). Conclusion The results indicate that AEV is circulating in the environment, and chickens were exposed to the field strain of AEV. To the best of our knowledge, this is the first report on AEV in chickens in Bangladesh. Proper vaccination and standard farm biosecurity practice could minimize AEV infection in chickens. A detailed epidemiology study, detection, and characterization of the AEV would be essential for effective AEV infection control.
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Affiliation(s)
- Md Zulfekar Ali
- Animal Health Research Division, Bangladesh Livestock Research Institute, Dhaka, Bangladesh
| | | | | | - Md Akramul Bary
- Central Poultry Laboratory, Nourish Poultry and Hatchery Ltd., Dhaka, Bangladesh
| | | | | | - Zafar Ahmed Bhuiyan
- Central Poultry Laboratory, Nourish Poultry and Hatchery Ltd., Dhaka, Bangladesh
| | - Md Giasuddin
- Animal Health Research Division, Bangladesh Livestock Research Institute, Dhaka, Bangladesh
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Shi L, Tian Z, Yang J, Gao S, Du J, Zhao Y, Liu Z, Guan G, Liu G, Luo J, Yin H. [Comparison of the antigenicity of African swine fever virus p35 protein as diagnostic antigen]. Sheng Wu Gong Cheng Xue Bao 2021; 37:187-195. [PMID: 33501800 DOI: 10.13345/j.cjb.200359] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In order to screen African swine fever virus (ASFV) diagnostic antigen with the best enzyme linked immunosorbent assay (ELISA) reactivity. By establishing the ELISA method, the diagnostic antigen of ASFV p30 protein expressed by baculovirus-insect cell expression system as reference, we explored the antigenic properties and diagnostic potential of ASFV p35 protein expressed by prokaryotic expression system as a diagnostic antigen. The results of Western blotting and immunofluorescence show that the molecular weight of the recombinant p35 protein and p30 protein obtained was 40 kDa and 30 kDa, respectively, and these two proteins had good immuno-reactivity with ASFV positive serum. Recombinant p30 and p35 proteins were used as diagnostic antigens to establish ELISA, and the sensitivity and repeatability of these methods were tested. The results show that although the detection sensitivity of the p30-ELISA established in this study was higher than that of the p35-ELISA, the sensitivity of p35-ELISA was 95.8%, and variations in intra- and inter-assay repeatability of the two methods were less than 10%. The coincidence rate between the p35-ELISA and the imported kit was 97.2%. Results show that p35-ELISA was sensitive and stable, and could detect specific antibodies against ASFV.
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Affiliation(s)
- Lei Shi
- State Key Laboratory of Veterinary Etiological Biology/Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, Gansu, China
| | - Zhancheng Tian
- State Key Laboratory of Veterinary Etiological Biology/Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, Gansu, China
| | - Jifei Yang
- State Key Laboratory of Veterinary Etiological Biology/Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, Gansu, China
| | - Shandian Gao
- State Key Laboratory of Veterinary Etiological Biology/Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, Gansu, China
| | - Junzheng Du
- State Key Laboratory of Veterinary Etiological Biology/Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, Gansu, China
| | - Yaru Zhao
- State Key Laboratory of Veterinary Etiological Biology/Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, Gansu, China
| | - Zhijie Liu
- State Key Laboratory of Veterinary Etiological Biology/Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, Gansu, China
| | - Guiquan Guan
- State Key Laboratory of Veterinary Etiological Biology/Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, Gansu, China
| | - Guangyuan Liu
- State Key Laboratory of Veterinary Etiological Biology/Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, Gansu, China
| | - Jianxun Luo
- State Key Laboratory of Veterinary Etiological Biology/Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, Gansu, China
| | - Hong Yin
- State Key Laboratory of Veterinary Etiological Biology/Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, Gansu, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, Jiangsu, China
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Bhartiya NM, Husain AA, Daginawala HF, Singh L, Kashyap RS. Development of an Immunodiagnostic Test for Screening Human Brucellosis Cases Using the Whole-Cell Antigens of Brucella abortus. Malays J Med Sci 2021; 27:15-26. [PMID: 33447131 PMCID: PMC7785268 DOI: 10.21315/mjms2020.27.6.3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Accepted: 09/21/2017] [Indexed: 11/23/2022] Open
Abstract
Background Human brucellosis is an important zoonotic disease of public health and often remains neglected owing to lack of sensitive and efficient diagnostic methods. This study evaluates diagnostic utility of in-house designed enzyme-linked immunosorbent assay (ELISA) using whole-cell antigens of Brucella abortus (B. abortus) S19 against the commercially available kits. Methods A prospective cohort study involving different populations within the Vidarbha regions of Maharashtra, India was conducted through camps organised from May 2009 to October 2015. A total of 568 serum samples were collected from high-risk people recruited as study cohorts based on inclusion criteria, additional risk factors and clinical symptoms. Samples were evaluated by indirect ELISA using the whole-cell antigens of B. abortus. The results were compared with the commercially available IgG detection ELISA kit to ascertain the specificity and sensitivity of the developed test. Results Fever, body ache, joint pain, lower back pain, loss of appetite and weight loss were major symptoms associated with the disease. With the cut-off of > 0.8, the positivity of brucellosis infection was at 12.32% (70/568) compared to 9.33% (53/568) as detected by the commercial kit. The in-house developed ELISA method yielded a sensitivity of 87.5% and specificity of 99.18% as compared to the commercial kits (sensitivity −80.30% and specificity −99.6%). Discussion The B. abortus S19-derived whole-cell protein-based ELISA is rapid and cost-effective and can be used for screening brucellosis infection in lieu of the commercially available ELISA kits.
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Affiliation(s)
- Nidhi M Bhartiya
- Biochemistry Research Laboratory, Central India Institute of Medical Sciences, Nagpur, India
| | - Aliabbas A Husain
- Biochemistry Research Laboratory, Central India Institute of Medical Sciences, Nagpur, India
| | - Hatim F Daginawala
- Biochemistry Research Laboratory, Central India Institute of Medical Sciences, Nagpur, India
| | - Lokendra Singh
- Biochemistry Research Laboratory, Central India Institute of Medical Sciences, Nagpur, India
| | - Rajpal S Kashyap
- Biochemistry Research Laboratory, Central India Institute of Medical Sciences, Nagpur, India
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30
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Moghaddam P, Zahmatkesh A, Bagheri M, Mahravani H. Are Epitopic Sites of 3AB and 3D Nonstructural Proteins Sufficient for Detection of Foot and Mouth Disease? Viral Immunol 2020; 34:79-85. [PMID: 33296262 DOI: 10.1089/vim.2020.0144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
An efficient method for detection of foot and mouth disease (FMD) and, particularly, differentiation of vaccinated from infected animals is the use of nonstructural (NS) proteins as antigens in Enzyme-Linked Immunosorbent Assay (ELISA) Kits. In this study, only epitopic regions of 3AB and 3D NS proteins were used for recombinant protein production, as a cost-effective method instead of peptide synthesis, for application in in-house ELISA diagnostic kits. Specific primers were designed according to the antigenic regions of 3AB (C-terminus of 3A and the whole 3B) and 3D (N-terminus) proteins, and the polymerase chain reaction (PCR) amplification was performed. Purified amplicons were cloned into pET21a (+) vectors and then transformed into Escherichia coli (BL21). Thereafter, bacteria were induced with 1 mM isopropyl β-d-1-thiogalactopyranoside (IPTG) for expression of antigenic proteins. Antigenic 3AB protein was expressed in soluble form, but 3D protein was extracted from the bacterial lysate. Protein expression was confirmed using sodium dodecyl sulfate-polyacrylamide gel electrophoresis and Western blot analyses. An indirect ELISA was developed for each protein, and the diagnostic sensitivity and specificity were determined. The 3AB-ELISA showed higher sensitivity and specificity than 3D-ELISA (95.24% and 100%, compared with 90.48% and 88.71%, respectively). The epitopic 3AB-ELISA developed here can be used for detection and differentiation of FMD infected from vaccinated animals, but the epitopic 3D-ELISA showed lower efficiency in screening for FMD status.
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Affiliation(s)
- Parvin Moghaddam
- Department of Cell and Molecular Biology, Faculty of Biological Sciences, Kharazmi University, Tehran, Iran
| | - Azadeh Zahmatkesh
- Department of Genomics and Genetic Engineering, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran
| | - Masoumeh Bagheri
- Department of Genomics and Genetic Engineering, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran
| | - Homayoon Mahravani
- Foot and Mouth Disease Reference Laboratory, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran
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31
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Qin Y, Sha R, Feng Y, Huang Y. Comparison of double antigen sandwich and indirect enzyme-linked immunosorbent assay for the diagnosis of hepatitis C virus antibodies. J Clin Lab Anal 2020; 34:e23481. [PMID: 33245583 PMCID: PMC7676215 DOI: 10.1002/jcla.23481] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 05/10/2020] [Accepted: 06/02/2020] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND The aim of this study is to compare double-antigen sandwich enzyme-linked immunosorbent assay (ELISA) and indirect ELISA in the diagnosis of hepatitis C virus(HCV)infection. METHODS AND MATERIALS A total of 176 samples from the Tumor Hospital Affiliated to Xin Jiang Medical University were utilized to comparison. All serum samples were tested using double-antigen sandwich ELISA and indirect ELISA. Cohen's kappa statistics were used to assess the agreement between the two assays, and multivariate analysis was used to evaluate risk factors for the discordance between the double-antigen ELISA and indirect ELISA. RESULTS The positivities of indirect ELISA (Beijing Wantai), double-antigen sandwich ELISA (Beijing Wantai), and indirect ELISA (Beijing Jinhao) were 74.43%, 68.75%, and 73.30%, respectively. The agreement between the indirect ELISA (Beijing Wantai) and double-antigen sandwich ELISA (Beijing Wantai) was high (κ = 0.829;P < .001), and the agreement between the double-antigen sandwich ELISA (Beijing Wantai) and indirect ELISA (Beijing Jinhao) was high (κ = 0.847;P < .001). Variables associated with discordant results between the double-antigen sandwich and indirect ELISA in multivariate analysis were as follows: female (OR:1.462; P < .05), age (<35 years old; OR:3.667; P < .05), and cancer (suffer from malignant tumor; OR:3.621; P < .05). CONCLUSION In detection of HCV, high agreement was found between the double-antigen sandwich ELISA and indirect ELISA. Female, younger age, and suffer from malignant tumor were significant risk factors for the discordance. Based on double-antigen sandwich ELISA has distinct methodological advantages over indirect ELISA. It is recommended for the diagnosis of HCV infection.
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Affiliation(s)
- Ya‐Juan Qin
- Clinical Laboratory CenterThe Tumor Hospital Affiliated to Xin Jiang Medical UniversityUrumqiChina
| | - Ruo‐cheng Sha
- Clinical Laboratory CenterThe Tumor Hospital Affiliated to Xin Jiang Medical UniversityUrumqiChina
| | - Yang‐Chun Feng
- Clinical Laboratory CenterThe Tumor Hospital Affiliated to Xin Jiang Medical UniversityUrumqiChina
| | - Yan‐Chun Huang
- Clinical Laboratory CenterThe Tumor Hospital Affiliated to Xin Jiang Medical UniversityUrumqiChina
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Singhla T, Tankaew P, Sthitmatee N. Validation of a Novel ELISA for the Diagnosis of Hemorrhagic Septicemia in Dairy Cattle from Thailand Using a Bayesian Approach. Vet Sci 2020; 7:E163. [PMID: 33126576 DOI: 10.3390/vetsci7040163] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Revised: 10/21/2020] [Accepted: 10/26/2020] [Indexed: 11/19/2022] Open
Abstract
The objective of this study was to estimate sensitivity (Se) and specificity (Sp) of a novel enzyme-linked immunosorbent assay (ELISA) test (using a coating antigen from Pasteurella multocida M-1404 via heat extraction) and an indirect hemagglutination (IHA) test for detection of Hemorrhagic septicemia (HS) in dairy cows, under Thai conditions, using a Bayesian approach. Dairy cow sera with a total of 1236 samples from 44 farms were tested with the two tests to detect immune responses against the HS. Percentages of positive samples for the ELISA and IHA tests were 73% (901/1236) and 70% (860/1236), respectively. Estimated sensitivity and estimated specificity of the ELISA test were 90.5% (95% posterior probability interval (PPI) = 83.2–95.4%) and 70.8% (95% PPI = 60.8–79.8%), respectively. Additionally, estimates for the Se and Sp values of the IHA test were 77.0% (95% PPI = 70.8–84.1%) and 51.1% (PPI = 36.8–66.3%), respectively. The estimated prevalence of the disease was 71.7% (95% PPI = 62.7–82.6%). These results demonstrate that the ELISA test can be a useful tool for the detection of the presence of an antibody against the HS in dairy cows. Notably, the cows in this area indicated a high percentage of exposure to Pasteurella multocida.
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Chen Q, Rong J, Li G, Xu B, Wang X, Hu J, Rong M, Li H. Establishment of a Rep' protein antibody detection method to distinguish natural infection with PCV2 from subunit vaccine immunization. J Med Microbiol 2020; 69:1183-1196. [PMID: 32812860 DOI: 10.1099/jmm.0.001230] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Introduction. PCV2 is a DNA virus that exists widely in pigs and has caused great economic losses to the pig industry worldwide. In the existing commercial PCV2 enzyme-linked immunosorbent assay (ELISA) kits both natural infection with PCV2 and vaccine immunization produce results that are positive for PCV2 Cap antibodies and therefore they cannot diagnose PCV2 infection in immunized pig farms.Aim. To establish a PCV2 non-structural protein antibody detection method that distinguishes between antibodies resulting from natural prior exposure (infection) and those induced by subunit vaccine immunization.Methodology. Based on the non-structural Rep' protein, we established an indirect ELISA (iELISA) using sera from guinea pigs and piglets.Results. The results for iELISA for guinea pig serum showed that animals vaccinated with a whole-virus inactivated PCV2 vaccine had 100 % (10/10) Cap antibody positivity and 100 % (10/10) Rep' antibody positivity. Guinea pigs vaccinated with a recombinant subunit PCV2 vaccine had 100 % (10/10) Cap antibody positivity, while no (0/10) guinea pigs were Rep' antibody-positive. The combined detection results for the Rep' iELISA and a PCV2 Antibody Test kit (Commercial) showed that pigs vaccinated with a whole-virus inactivated PCV2 vaccine or PCV2 SD/2017 had 100 % (5/5) Cap antibody positivity and 100 % (5/5) Rep' antibody positivity. Pigs vaccinated with a recombinant subunit PCV2 vaccine had 100 % (5/5) Cap antibody positivity, while no (0/10) pigs were Rep' antibody-positive.Conclusion. This paper describes an effective iELISA method that can distinguish natural infection with PCV2 (Cap and Rep positive) or inoculation with a whole-virus inactivated vaccine (Cap and Rep positive) from subunit vaccine immunization (Cap-positive, Rep-negative). These comparative assays could be very useful in the control of PCV2 in pig herds.
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Affiliation(s)
- Qingqing Chen
- Institute of Biomedicine, Yangtze University, JingZhou, HuBei 434025, PR China.,College of Life Sciences, Yangtze University, JingZhou, HuBei 434025, PR China
| | - Jun Rong
- College of Life Sciences, Yangtze University, JingZhou, HuBei 434025, PR China.,Yebio Bioengineering Co. Ltd Qingdao, QingDao, ShanDong 266114, PR China.,Institute of Biomedicine, Yangtze University, JingZhou, HuBei 434025, PR China
| | - Guopan Li
- Institute of Biomedicine, Yangtze University, JingZhou, HuBei 434025, PR China.,College of Life Sciences, Yangtze University, JingZhou, HuBei 434025, PR China
| | - Baojuan Xu
- Yebio Bioengineering Co. Ltd Qingdao, QingDao, ShanDong 266114, PR China
| | - Xi Wang
- Institute of Biomedicine, Yangtze University, JingZhou, HuBei 434025, PR China.,College of Life Sciences, Yangtze University, JingZhou, HuBei 434025, PR China
| | - Jixiong Hu
- Institute of Biomedicine, Yangtze University, JingZhou, HuBei 434025, PR China.,College of Life Sciences, Yangtze University, JingZhou, HuBei 434025, PR China
| | - Mingxuan Rong
- Institute of Biomedicine, Yangtze University, JingZhou, HuBei 434025, PR China.,College of Life Sciences, Yangtze University, JingZhou, HuBei 434025, PR China
| | - Huan Li
- Institute of Biomedicine, Yangtze University, JingZhou, HuBei 434025, PR China
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Wei W, Shen N, Xiao J, Tao Y, Luo Y, Angel C, Gu X, Xie Y, He R, Jing B, Peng X, Yang G. Expression Analysis and Serodiagnostic Potential of Microneme Proteins 1 and 3 in Eimeria stiedai. Genes (Basel) 2020; 11:genes11070725. [PMID: 32610686 PMCID: PMC7397282 DOI: 10.3390/genes11070725] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2020] [Revised: 06/26/2020] [Accepted: 06/27/2020] [Indexed: 01/21/2023] Open
Abstract
Eimeria stiedai is an apicomplexan protozoan parasite that invades the liver and bile duct epithelial cells in rabbits and causes severe hepatic coccidiosis, resulting in significant economic losses in the domestic rabbit industry. Hepatic coccidiosis lacks the typical clinical symptoms and there is a lack of effective premortem tools to timely diagnose this disease. Therefore, in the present study we cloned and expressed the two microneme proteins i.e., microneme protein 1 (EsMIC1) and microneme protein 3 (EsMIC3) from E. stiedai and used them as recombinant antigens to develop a serodiagnostic method for an effective diagnosis of hepatic coccidiosis. The cDNAs encoding EsMIC1 and EsMIC3 were cloned and the mRNA expression levels of these two genes at different developmental stages of E. stiedai were determined by quantitative real-time PCR analysis (qRT-PCR). The immunoreactivity of recombinant EsMIC1 (rEsMIC1) and EsMIC3 (rEsMIC3) proteins were detected by Western blotting, and indirect enzyme-linked immunosorbent assays (ELISAs) based on these two recombinant antigens were established to evaluate their serodiagnostic potential. Our results showed that the proteins encoded by the ORFs of EsMIC1 (711 bp) and EsMIC3 (891 bp) were approximately 25.89 and 32.39 kDa in predicted molecular weight, respectively. Both EsMIC1 and EsMIC3 showed the highest mRNA expression levels in the merozoites stage of E. stiedai. Western blotting analysis revealed that both recombinant proteins were recognized by E. stiedai positive sera, and the indirect ELISAs using rEsMIC1 and rEsMIC3 were developed based on their good immunoreactivity, with 100% (48/48) sensitivity and 97.9% (47/48) specificity for rEsMIC1 with 100% (48/48) sensitivity and 100% (48/48) specificity for rEsMIC3, respectively. Moreover, rEsMIC1- and rEsMIC3-based indirect ELISA were able to detect corresponding antibodies in sera at days 6, 8, and 10 post E. stiedai infection, with the highest positive diagnostic rate (62.5% (30/48) for rEsMIC1 and 66.7% (32/48) for rEsMIC3) observed at day 10 post infection. Therefore, both EsMIC1 and EsMIC3 can be used as potential serodiagnostic candidate antigens for hepatic coccidiosis caused by E. stiedai.
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Affiliation(s)
- Wenrui Wei
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Wenjiang 611130, China; (W.W.); (N.S.); (J.X.); (Y.T.); (Y.L.); (C.A.); (X.G.); (Y.X.); (R.H.); (B.J.)
| | - Nengxing Shen
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Wenjiang 611130, China; (W.W.); (N.S.); (J.X.); (Y.T.); (Y.L.); (C.A.); (X.G.); (Y.X.); (R.H.); (B.J.)
| | - Jie Xiao
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Wenjiang 611130, China; (W.W.); (N.S.); (J.X.); (Y.T.); (Y.L.); (C.A.); (X.G.); (Y.X.); (R.H.); (B.J.)
| | - Yuanyuan Tao
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Wenjiang 611130, China; (W.W.); (N.S.); (J.X.); (Y.T.); (Y.L.); (C.A.); (X.G.); (Y.X.); (R.H.); (B.J.)
| | - Yuejun Luo
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Wenjiang 611130, China; (W.W.); (N.S.); (J.X.); (Y.T.); (Y.L.); (C.A.); (X.G.); (Y.X.); (R.H.); (B.J.)
| | - Christiana Angel
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Wenjiang 611130, China; (W.W.); (N.S.); (J.X.); (Y.T.); (Y.L.); (C.A.); (X.G.); (Y.X.); (R.H.); (B.J.)
- Department of Veterinary Parasitology, Faculty of Veterinary Sciences, Shaheed Benazir Bhutto University of Veterinary and Animal Sciences, Sakrand 67210, Sindh, Pakistan
| | - Xiaobin Gu
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Wenjiang 611130, China; (W.W.); (N.S.); (J.X.); (Y.T.); (Y.L.); (C.A.); (X.G.); (Y.X.); (R.H.); (B.J.)
| | - Yue Xie
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Wenjiang 611130, China; (W.W.); (N.S.); (J.X.); (Y.T.); (Y.L.); (C.A.); (X.G.); (Y.X.); (R.H.); (B.J.)
| | - Ran He
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Wenjiang 611130, China; (W.W.); (N.S.); (J.X.); (Y.T.); (Y.L.); (C.A.); (X.G.); (Y.X.); (R.H.); (B.J.)
| | - Bo Jing
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Wenjiang 611130, China; (W.W.); (N.S.); (J.X.); (Y.T.); (Y.L.); (C.A.); (X.G.); (Y.X.); (R.H.); (B.J.)
| | - Xuerong Peng
- Department of Chemistry, College of Life and Basic Science, Sichuan Agricultural University, Wenjiang 611130, China;
| | - Guangyou Yang
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Wenjiang 611130, China; (W.W.); (N.S.); (J.X.); (Y.T.); (Y.L.); (C.A.); (X.G.); (Y.X.); (R.H.); (B.J.)
- Correspondence:
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Romanelli PR, de Matos AMRN, Pinto-Ferreira F, Caldart ET, Mareze M, Matos RLN, Freire RL, Mitsuka-Breganó R, Headley SA, Minho AP, da Rocha Cavalcante AC, Okano W, Kohek Júnior I, Rodrigues RO, Navarro IT. Seroepidemiology of ovine toxoplasmosis and neosporosis in breeding rams from Rio Grande do Sul, Brazil. Transbound Emerg Dis 2020; 67 Suppl 2:208-211. [PMID: 32597025 DOI: 10.1111/tbed.13593] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
This study determined the prevalence of ovine toxoplasmosis and neosporosis and the risk factors associated with the development of these diseases in breeding rams from the State of Rio Grande do Sul (RS), Southern Brazil. Serum samples (n = 1,800) from breeding rams maintained on 705 sheep farms from seven mesoregions were evaluated serologically to detect anti-IgG Toxoplasma gondii by indirect ELISA and anti-IgG Neospora caninum by the indirect immunofluorescence assay (IFA). The prevalence of T. gondii was 33.05% (595/1,800); seropositivity to N. caninum was 18.44% (332/1,800). Additionally, there was simultaneous seropositivity (8.94%;161/1,800) to N. caninum and T. gondii. The variables size of the property (<500 ha) (Prevalence Ratio, PR = 1.36); breeding system (semi-intensive/intensive) (PR = 1.23); and natural mounting without control (PR = 1.50) were considered as risk factors for the occurrence of T. gondii. Size of the property (<500 ha) (PR = 1.58) and natural mounting without control (PR = 2.32) were risk factors associated with the prevalence of N. caninum in rams. Additionally, separation of ewes prior to parturition was considered as a protective factor for the occurrence of T. gondii (PR = 0.82) and N. caninum (PR = 0.74). These results demonstrated that these two parasitic disease agents are endemic in rams throughout all regions of RS.
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Affiliation(s)
- Paulo Roberto Romanelli
- Department of Veterinary Preventive Medicine, Universidade Estadual de Londrina, Londrina, Brazil
| | | | - Fernanda Pinto-Ferreira
- Department of Veterinary Preventive Medicine, Universidade Estadual de Londrina, Londrina, Brazil
| | - Eloiza Teles Caldart
- Department of Veterinary Preventive Medicine, Universidade Estadual de Londrina, Londrina, Brazil
| | - Marcelle Mareze
- Department of Veterinary Preventive Medicine, Universidade Estadual de Londrina, Londrina, Brazil
| | | | - Roberta Lemos Freire
- Department of Veterinary Preventive Medicine, Universidade Estadual de Londrina, Londrina, Brazil
| | - Regina Mitsuka-Breganó
- Department of Veterinary Preventive Medicine, Universidade Estadual de Londrina, Londrina, Brazil
| | - Selwyn Arlington Headley
- Department of Veterinary Preventive Medicine, Universidade Estadual de Londrina, Londrina, Brazil
| | | | | | - Werner Okano
- Self-employed, Practicing Veterinarian, Londrina, Paraná, Brazil
| | - Ivo Kohek Júnior
- Médico Veterinário Fiscal Estadual Agropecuário, IPVDF, Rio Grande do Sul, Brazil
| | - Rogerio Oliveira Rodrigues
- Pesquisador IV-Especial, Laboratório Leptospirose, Instituto de Pesquisas Veterinárias Desidério Finamor - IPVDF/SEAPDR, Eldorado do Sul, Rio Grande do Sul, Brazil
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Wang Z, Shi Y, Wang Y, Zhao L, Cui X, Wen S, Liu H, Cui W, Chen H, Ge J. Detection of Antibodies Against Canine Circovirus in Naturally and Experimentally Infected Canines by Recombinant Capsid Enzyme-Linked Immunosorbent Assay. Front Vet Sci 2020; 7:294. [PMID: 32548131 PMCID: PMC7270207 DOI: 10.3389/fvets.2020.00294] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Accepted: 04/29/2020] [Indexed: 11/30/2022] Open
Abstract
Canine circovirus (CanineCV), a new pathogen, was found to be associated with canine hemorrhagic diarrhea, vasculitis, granulomatous lymphadenitis, and acute gastroenteritis. Although CanineCV was highly positive rate in diarrhea cases, its pathogenicity remains controversial. In this study, the seroprevalence and associated risk factors of CanineCV infection among domestic dogs in northeastern China was investigated by an indirect enzyme-linked immunosorbent assay (iELISA) based on recombinant capsid protein. Results revealed the proposed iELISA had no cross-reactivity with other related pathogens, and yielded good diagnostic values. Then, to evaluate the rCap iELISA, this study applied it to detect antibodies against CanineCV in 1,047 clinical serum samples obtained from northeastern China in 2016–2017. Results showed the positive rates in the five cities of Jilin, Liaoning, and Heilongjiang provinces ranged from 22.22 to 42.29%. Statistical analysis shows a significant difference in age between dogs <3 months old with respect to the >1-year-old dogs (p = 0.005), that is, the CanineCV infection was more frequently identified from older dogs. In the artificially infected experiment, the dogs developed seroconversion after 9 or 12 days and the main way of virus excretion was through feces. More interestingly, among the 32 ELISA-positive serum samples, 34.75% samples tested positive for the CanineCV DNA by qPCR, far higher than that in ELISA-negative serum samples (5.26%, 2/38). This report is the first to demonstrate that CanineCV infection is common in the dog population in northeastern China. The results showed obvious differences in the positive rate associated with diarrhea, age, but not with different cities. This study also provide basis for evaluating the pathogenic potential of CanineCV. But, the pathogenicity, the relationship between antibody level and immune protection, and the harmful effects of this virus remain to be established.
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Affiliation(s)
- Zheng Wang
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
| | - Yunjia Shi
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
| | - Yu Wang
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,State Key Laboratory of Veterinary Biotechnology, Heilongjiang Provincial Key Laboratory of Laboratory Animal and Comparative Medicine, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Lili Zhao
- State Key Laboratory of Veterinary Biotechnology, Heilongjiang Provincial Key Laboratory of Laboratory Animal and Comparative Medicine, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Xingyang Cui
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
| | - Shanshan Wen
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
| | - Hanghang Liu
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
| | - Wen Cui
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Northeastern Science Inspection Station, China Ministry of Agriculture Key Laboratory of Animal Pathogen Biology, Harbin, China
| | - Hongyan Chen
- State Key Laboratory of Veterinary Biotechnology, Heilongjiang Provincial Key Laboratory of Laboratory Animal and Comparative Medicine, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Junwei Ge
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Northeastern Science Inspection Station, China Ministry of Agriculture Key Laboratory of Animal Pathogen Biology, Harbin, China
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37
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Wanganurakkul S, Smith DR, Chintapitaksakul L, Assavalapsakul W. Effective production of recombinant Δ60VP1 chicken anemia virus protein in Escherichia coli and its application to a serodiagnostic indirect ELISA. J Virol Methods 2020; 282:113887. [PMID: 32445874 DOI: 10.1016/j.jviromet.2020.113887] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 05/05/2020] [Accepted: 05/17/2020] [Indexed: 01/01/2023]
Abstract
Chicken anemia virus (CAV) causes severe anemia and immunosuppression in chickens. VP1 is the main capsid protein, and is suitable for diagnostic kit development, however, it has 24 arginine residues in the first forty N-terminal amino acids of the protein causing toxicity to bacteria leading to reduced prokaryotic expression. In this study, a 60 amino acid N-terminally truncated VP1 (Δ60VP1) which removes the toxic region was expressed in Escherichia coli and the resultant insoluble recombinant protein was purified by Ni-NTA affinity chromatography with anionic denaturing detergents. The high amounts of purified Δ60VP1 produced (150 mg/L) retained appropriate antigenicity and the antigen was used to develop an indirect enzyme-linked immunosorbent assay (ELISA) for serological diagnosis of CAV. One hundred fifty-two chicken serum samples (n = 152) were evaluated using the newly developed Δ60VP1 indirect ELISA (cutoff value = 7.58 % S/P). The sensitivity and specificity of the Δ60VP1 indirect ELISA were 87.50 % and 95.31 %, respectively, while the agreement between the Δ60VP1 indirect ELISA and the commercial IDEXX CAV ELISA was 90.79 % (kappa = 0.814). In this study, we have developed an alternative VP1 production platform in E. coli by truncating the N-terminal 60 amino acids (Δ60VP1) and using anionic denaturing detergents during the purification to successfully solubilize the insoluble Δ60VP1. The antigen was purified with high yield and good immunoreactivity, and an indirect ELISA was developed. The assay could potentially be applied to large-scale CAV serosurveillance.
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Affiliation(s)
- Saruda Wanganurakkul
- Department of Microbiology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand; Eastern Region Veterinary Research and Development Center, Chonburi 20220, Thailand.
| | - Duncan R Smith
- Institute of Molecular Biosciences, Mahidol University, Nakornpathom 73170, Thailand.
| | | | - Wanchai Assavalapsakul
- Department of Microbiology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
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38
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Liang Y, Song H, Wu M, Xie Y, Gu X, He R, Lai W, Jing B, Peng X, Yang G. Preliminary Evaluation of Recombinant EPC1 and TPx for Serological Diagnosis of Animal Cystic Echinococcosis. Front Cell Infect Microbiol 2020; 10:177. [PMID: 32426296 PMCID: PMC7203340 DOI: 10.3389/fcimb.2020.00177] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Accepted: 04/03/2020] [Indexed: 11/13/2022] Open
Abstract
Animal cystic echinococcosis (CE) is one of the most important helminthic diseases and affects many mammalian intermediate hosts. Practical and effective diagnosis is crucial for animal CE control. Two different recombinant antigens derived from Echinococcus granulosus, Echinococcus protoscolex calcium binding protein 1 (rEg-EPC1) and thioredoxin peroxidase (rEg-TPx), were evaluated in this study to detect the specific immunoglobulin G (IgG) in sheep and goat with CE by the indirect enzyme-linked immunosorbent assays. The diagnostic effect of the above-listed proteins was determined to their sensitivity and specificity and compared with hydatid cyst fluid, two previously reported immunogenic recombinant proteins (dihydrofolate reductase and P29), and two commercial kits available in China. Of these, the best diagnostic results were obtained in the anti-TPx IgG ELISA, with 92.6% sensitivity, 98.8% specificity, and no cross-reactivity with anti-Eg95 IgG. Recombinant E. granulosus thioredoxin peroxidase shows good potential for serological diagnosis of animal cystic echinococcosis.
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Affiliation(s)
- Yuqing Liang
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, China
| | - Hongyu Song
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, China
| | - Maodi Wu
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, China
| | - Yue Xie
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, China
| | - Xiaobin Gu
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, China
| | - Ran He
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, China
| | - Weiming Lai
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, China
| | - Bo Jing
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, China
| | - Xuerong Peng
- Department of Chemistry, College of Life and Basic Science, Sichuan Agricultural University, Chengdu, China
| | - Guangyou Yang
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, China
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Panadero R, López CM, Remesar S, Cabanelas E, Varas G, Markina F, Díaz P, García-Dios D, Prieto A, Fernández G, Díez-Baños P, Morrondo P. Temporal and spatial spread of Hypoderma actaeon infection in roe deer from peninsular Spain determined by an indirect enzyme-linked immunosorbent assay. Med Vet Entomol 2020; 34:44-48. [PMID: 31444796 DOI: 10.1111/mve.12404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Revised: 08/05/2019] [Accepted: 08/06/2019] [Indexed: 06/10/2023]
Abstract
The host switching of Hypoderma actaeon (Diptera: Oestridae), a specific parasite of red deer (Cervus elaphus), towards roe deer (Capreolus capreolus) has been recently reported in Spain. To provide information about the temporal and spatial spreading of H. actaeon infection in roe deer, 244 serum samples from animals hunted in Spain between 2013 and 2018 were analysed by an indirect enzyme-linked immunosorbent assay. The overall seropositivity was 13.9%. Seropositivity was higher in continental (27.7%) and mountainous (12%) areas from central Spain, followed by southern-Mediterranean (11.2%) and northern-oceanic regions (3.5%). Differences were significant between central-continental and northern-oceanic regions (P = 0.003). No differences were found according to the sex and age of roe deer (P > 0.05). In 2013, all seropositive animals were concentrated in two distant areas in central and southern Spain, suggesting that the host switch could have occurred independently in both regions. Changes in the pattern of distribution of red deer and roe deer could have favoured the spreading of this myiasis towards roe deer, indicating that roe deer may become infested by H. actaeon in areas where both cervids coexist at high densities.
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Affiliation(s)
- R Panadero
- INVESAGA Group, Department of Animal Pathology. Faculty of Veterinary, University of Santiago de Compostela, Lugo, Spain
| | - C M López
- INVESAGA Group, Department of Animal Pathology. Faculty of Veterinary, University of Santiago de Compostela, Lugo, Spain
| | - S Remesar
- INVESAGA Group, Department of Animal Pathology. Faculty of Veterinary, University of Santiago de Compostela, Lugo, Spain
| | - E Cabanelas
- INVESAGA Group, Department of Animal Pathology. Faculty of Veterinary, University of Santiago de Compostela, Lugo, Spain
| | - G Varas
- Spanish Roe Deer Association, ACE-Asociación del Corzo Español, Madrid, Spain
| | - F Markina
- Spanish Roe Deer Association, ACE-Asociación del Corzo Español, Madrid, Spain
| | - P Díaz
- INVESAGA Group, Department of Animal Pathology. Faculty of Veterinary, University of Santiago de Compostela, Lugo, Spain
| | - D García-Dios
- INVESAGA Group, Department of Animal Pathology. Faculty of Veterinary, University of Santiago de Compostela, Lugo, Spain
| | - A Prieto
- INVESAGA Group, Department of Animal Pathology. Faculty of Veterinary, University of Santiago de Compostela, Lugo, Spain
| | - G Fernández
- INVESAGA Group, Department of Animal Pathology. Faculty of Veterinary, University of Santiago de Compostela, Lugo, Spain
| | - P Díez-Baños
- INVESAGA Group, Department of Animal Pathology. Faculty of Veterinary, University of Santiago de Compostela, Lugo, Spain
| | - P Morrondo
- INVESAGA Group, Department of Animal Pathology. Faculty of Veterinary, University of Santiago de Compostela, Lugo, Spain
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40
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Tan Y, Dong G, Niu J, Guo Y, Yi S, Sun M, Wang K, Hu G. Development of an indirect ELISA based on glycoprotein B gene for detecting of Feline herpesvirus type 1. Pol J Vet Sci 2020; 22:631-633. [PMID: 31560479 DOI: 10.24425/pjvs.2019.129971] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The study was aimed to develop an indirect enzyme-linked immunosorbent assay (ELISA), which can detect specifically Feline herpesvirus type 1 (FHV-1). The primers were designed based on the conserved sequence of FHV-1 glycoprotein B gene. The recombinant protein with reactogenicity was purified as coating antigen of the assay. The indirect ELISA, characterized by high sensitivity showed no cross-reaction with two types of feline virus, had detection limit at 1:2000 dilution. The positive rate of the assay, according to the determined cutoff value (0.25), was basically consistent with Feline Herpes Virus Antibody ELISA kit. In conclusion, the indirect ELISA with high repeatability and reproducibility can be used for detecting FHV-1, and can provide necessary support to related research.
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Affiliation(s)
- Y Tan
- College of Animal Science and Technology, Jilin Agricultural University, Changchun 130118, P.R.China
| | - G Dong
- Beijing Normal University's Global Change and Earth System Science Research Institute, Beijing 100875, P. R. China
| | - J Niu
- College of Animal Science and Technology, Jilin Agricultural University, Changchun 130118, P.R.China
| | - Y Guo
- College of Animal Science and Technology, Jilin Agricultural University, Changchun 130118, P.R.China.,Animal Husbandry and Veterinary Science Research Institute of Jilin Province, Xian Street No. 4510, Changchun, P. R. China
| | - S Yi
- College of Animal Science and Technology, Jilin Agricultural University, Changchun 130118, P.R.China
| | - M Sun
- College of Animal Science and Technology, Jilin Agricultural University, Changchun 130118, P.R.China
| | - K Wang
- College of Animal Science and Technology, Jilin Agricultural University, Changchun 130118, P.R.China
| | - G Hu
- College of Animal Science and Technology, Jilin Agricultural University, Changchun 130118, P.R.China
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Böröcz K, Csizmadia Z, Markovics Á, Farkas N, Najbauer J, Berki T, Németh P. Application of a fast and cost-effective 'three-in-one' MMR ELISA as a tool for surveying anti-MMR humoral immunity: the Hungarian experience. Epidemiol Infect 2020; 148:e17. [PMID: 32014073 PMCID: PMC7019553 DOI: 10.1017/s0950268819002280] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Revised: 10/30/2019] [Accepted: 12/18/2019] [Indexed: 12/27/2022] Open
Abstract
In Hungary, between February 2017 and July 2019, 70 confirmed measles cases were reported, raising questions about the adequacy of population-level immunity. Although the assumed vaccination coverage is ≥99%, in a recent study, we detected potential gaps in the anti-measles humoral immunity. In Hungary, according to a decree by the Ministry of Public Welfare, beginning from 2021, the healthcare provider should conduct a serosurvey of anti-measles protection levels of healthcare professionals. To facilitate the compliance with this requirement, we developed a quick 'three-in-one' or 'triple' MMR (measles, mumps and rubella) indirect ELISA (IgG); an assay format that is currently not available commercially. High throughput applicability of the 'three-in-one' ELISA was verified using 1736 sera from routine laboratory residual samples, using an automated platform (Siemens BEP 2000 Advance). Assay verification was performed by comparing the full antigen repertoire-based 'target' assay with in-house 'control' assays using recombinant viral antigen coatings, and by validated commercially available kits. Indirect immunofluorescence was used as an independent reference method. Data were analysed using OriginLab, IBM SPSS, RStudio and MedCalc. In case of measles, we combined our current results with previously published data (Ntotal measles = 3523). Evaluation of anti-mumps and anti-rubella humoral antibody levels was based on the measurement of 1736 samples. The lowest anti-measles seropositivity (79.3%) was detected in sera of individuals vaccinated between 1978 and 1987. Considering the antigen-specific seropositivity ratios of all samples measured, anti-measles, -mumps and -rubella IgG antibody titres were adequate in 89.84%, 91.82% and 92.28%, respectively. Based on the virus-specific herd immunity threshold (HIT) values (HITMeasles = 92-95%, HITMumps = 75-86%, HITRubella = 83-86), it can be stated that regarding anti-measles immunity, certain age clusters of the population may have inadequate levels of humoral immunity. Despite the potential gaps in herd immunity, the use of MMR vaccine remains an effective and low-cost approach for the prevention of measles, mumps and rubella infections.
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Affiliation(s)
- K. Böröcz
- Department of Immunology and Biotechnology, Clinical Centre, University of Pécs Medical School, Pécs, Hungary
| | - Z. Csizmadia
- Department of Immunology and Biotechnology, Clinical Centre, University of Pécs Medical School, Pécs, Hungary
| | - Á. Markovics
- Department of General and Physical Chemistry, Faculty of Natural Sciences, University of Pécs, Pécs, Hungary
| | - N. Farkas
- Department of Bioanalysis, University of Pécs Medical School, Pécs, Hungary
| | - J. Najbauer
- Department of Immunology and Biotechnology, Clinical Centre, University of Pécs Medical School, Pécs, Hungary
| | - T. Berki
- Department of Immunology and Biotechnology, Clinical Centre, University of Pécs Medical School, Pécs, Hungary
| | - P. Németh
- Department of Immunology and Biotechnology, Clinical Centre, University of Pécs Medical School, Pécs, Hungary
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Zhang S, Yang J, Wang Z, Chen L, Diao Y, Tang Y. Research Note: Development of an ELISA to distinguish between goose parvovirus infection and vaccine immunization antibodies. Poult Sci 2020; 99:1332-1340. [PMID: 32111309 PMCID: PMC7587739 DOI: 10.1016/j.psj.2019.12.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Accepted: 09/06/2019] [Indexed: 11/30/2022] Open
Abstract
Goose parvovirus (GPV) leads to a huge loss in the poultry industry, and early diagnosis is required to prevent the disease from spreading. At present, there are a variety of detection methods for GPV infection, and the ELISA method has the advantages of simple and rapid operation. However, most ELISA methods for detecting GPV can only detect the antibody level of the sample, but cannot distinguish between the GPV infection and vaccine immunization antibodies. Therefore, this study has a wider application value by establishing the detection method based on the structure and non-structural protein of the virus. The GPV non-structural (NS1) and structure (VP3) fusion proteins were used as coating antigens to establish 2 indirect ELISA methods, and the detection conditions were optimized. A series of experiments proved that the detection method has good specificity, sensitivity, and repeatability. The test results of 120 immune sera samples and 145 natural infection serum samples showed that the positive rates of immunized serum were 9.17% (NS1) and 88.33% (VP3), and the positive rates of natural infection were 88.97% (NS1) and 86.21% (VP3), which distinguish between the GPV infection and vaccine immunization antibodies. The establishment of 2 indirect ELISA methods using NS1 and VP3 proteins as inclusion antigens provides a new method for detecting GPV infection and inactivated immune antibodies, which lays a foundation for the serological diagnosis and epidemiological monitoring of GPV.
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Affiliation(s)
- Shuai Zhang
- College of Animal Science and Technology, Shandong Agricultural University, Tai'an, Shandong Province 271018, China; Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Tai'an, Shandong 271018, China; Shandong Provincial Engineering Technology Research Center of Animal Disease Control and Prevention, Tai'an, Shandong 271018, China
| | - Jing Yang
- College of Animal Science and Technology, Shandong Agricultural University, Tai'an, Shandong Province 271018, China; Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Tai'an, Shandong 271018, China; Shandong Provincial Engineering Technology Research Center of Animal Disease Control and Prevention, Tai'an, Shandong 271018, China
| | - Zhenzhong Wang
- College of Animal Science and Technology, Shandong Agricultural University, Tai'an, Shandong Province 271018, China; Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Tai'an, Shandong 271018, China; Shandong Provincial Engineering Technology Research Center of Animal Disease Control and Prevention, Tai'an, Shandong 271018, China
| | - Lin Chen
- Animal Health Inspection of DaLian Free Trade Zone, DaLian, LiaoNing 116600, China
| | - Youxiang Diao
- College of Animal Science and Technology, Shandong Agricultural University, Tai'an, Shandong Province 271018, China; Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Tai'an, Shandong 271018, China; Shandong Provincial Engineering Technology Research Center of Animal Disease Control and Prevention, Tai'an, Shandong 271018, China
| | - Yi Tang
- College of Animal Science and Technology, Shandong Agricultural University, Tai'an, Shandong Province 271018, China; Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Tai'an, Shandong 271018, China; Shandong Provincial Engineering Technology Research Center of Animal Disease Control and Prevention, Tai'an, Shandong 271018, China.
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Aimulajiang K, Cao M, Liao S, Naqvi MA, Tian X, Li Z, Lu M, Lakho SA, Li X, Xu L, Song X, Yan R. Development and Potential Application of Ras Domain Containing Protein from Haemonchus contortus for Diagnosis of Goat Infection. Animals (Basel) 2020; 10:E138. [PMID: 31952259 DOI: 10.3390/ani10010138] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2019] [Revised: 01/05/2020] [Accepted: 01/10/2020] [Indexed: 02/07/2023] Open
Abstract
Haemonchus contortus is an important gastrointestinal nematode of small ruminants that causes significant mortality in goats worldwide. Diagnosis of this infection mainly depends on the evaluation of clinical signs and fecal examination. However, limitations often occur in early or mild infections. For this purpose, serological diagnosis seems to be more accurate and reliable. Ras domain-containing protein (Ras) is one of H. contortus's excretory and secretory products (ESPs) that can be isolated from different larval stages of the nematode. In this study, the recombinant H. contortus Ras domain-containing protein (rHcRas) was expressed and purified and its diagnostic potential was evaluated. Reactions between rHcRas and goat sera were tested using Western blotting (WB). The results showed that rHcRas could be recognized by sera as early as 14 days post infection (DPI), and antibodies against rHcRas in infected goats could be maintained for over 89 days. No reaction was found between rHcRas and antibodies against Trichinella spiralis, Fasciola hepatica, or Toxoplasma gondii. An indirect enzyme-linked immunosorbent assay (ELISA) was produced based on rHcRas. The optimal coating antigen (157 ng of rHcRas/well) and serum dilutions (1:50) were determined via checkerboard titration. Indirect ELISA based on rHcRas showed 87.5% sensitivity and 90.6% specificity. The cut-off values for this experiment were determined to be 0.324 (positive) and 0.273 (negative), respectively, and the variation coefficient (CV) was less than 15%. The results of the indirect ELISA in-field examination showed that 17.6% (9/51) of the goats were infected with H. contortus, higher than the fecal examination results (15.7%, 8/51). When compared the results of the indirect ELISA and necropsy testing, 98.0% (50/51) consistency was found. These results indicated that rHcRas was a potential antigen for the diagnosis of H. contortus infection in goats.
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Aimulajiang K, Naqvi MA, Chu W, Lu M, Tian X, Bu Y, Memon MA, Li X, Xu L, Song X, Yan R. Adhesion-Regulating Molecule from Haemonchus contortus: Potential Antigen for Diagnosis of Early Infection in Goats. Pathogens 2019; 9:E34. [PMID: 31905914 DOI: 10.3390/pathogens9010034] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Revised: 12/22/2019] [Accepted: 12/27/2019] [Indexed: 11/16/2022] Open
Abstract
Haemonchus contortus, a blood-sucking nematode of ruminants, causes large economic losses worldwide. Diagnosis of infection mainly depends on the evaluation of clinical signs and fecal examination. However, this has limitations for the diagnosis of early or light infections, where serological diagnosis seems to be more accurate and reliable. In this study, the recombinant H. contortus adhesion-regulating molecule protein (rHCADRM) was expressed and purified, and its diagnostic potential was evaluated. Serum samples from goats experimentally infected with H. contortus (n = 5) were collected at 0 (before infection, negative control), 7, 14, 21, 35, 49, 63, 85, and 103 days post-infection (DPI). The reactions between rHcADRM and goat serum were tested using Western blot (WB) analysis. The results show that rHcADRM can be recognized in the serum as early as 14 DPI, and the antibody against rHcADRM in infected goat could be maintained for over 89 days. No reaction was found between rHcADRM and antibodies against Trichinella spiralis, Fasciola hepatica, or Toxoplasma gondii. An indirect enzyme-linked immune sorbent assay (ELISA) was developed based on rHcADRM. The optimal coating antigen (279 ng of rHcADRM/well) and serum dilutions (1:50) were determined by checkerboard titration. A total of 64 serum samples, including 32 from H. contortus infection goats and 32 from helminth-free goats, were used to determine the positive (0.362) and negative (0.306) cut-off values for the ELISA. The results show this serological diagnosis method is highly sensitive (90.6%) and specific (93.75%). The coefficient of variation within run and between runs was less than 11%. To apply this indirect ELISA during field examination, 51 serum samples were randomly collected from goat farms and tested using this method. The result showed that 19.6% (10/51) of goats were infected with H. contortus, which was 100% consistent with the necropsy result, higher than that of fecal examination (15.7%, 8/51). These results indicate that rHcADRM could be a potential antigen for diagnosis of H. contortus infection in goats.
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Gu X, Gu J, Ren Y, Zheng Y, Yang G, Zhou X, Xie Y. Evaluation of an Indirect ELISA Using Recombinant Arginine Kinase for Serodiagnosis of Psoroptes ovis var. cuniculi Infestation in Rabbits. Front Vet Sci 2019; 6:411. [PMID: 31824969 PMCID: PMC6879429 DOI: 10.3389/fvets.2019.00411] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Accepted: 11/05/2019] [Indexed: 11/23/2022] Open
Abstract
Psoroptes ovis var. cuniculi is a common ectoparasite of the wild and domestic rabbits worldwide, which causes significant economic losses in commercial rabbit breeding. In China, the diagnosis of rabbits infested with P. ovis var. cuniculi currently relies on detection of clinical signs and Psoroptes mites in skin scrapings by microscopy examination. However, this method is not very efficient in detection of the low mite loads and/or sub-clinical infections. In the present study, we cloned and expressed an arginine kinase homolog gene from P. ovis var. cuniculi (Poc-AK) and used its recombinant protein rPoc-AK to develop an indirect enzyme-linked immunosorbent assay (iELISA) method for diagnosis of P. ovis var. cuniculi infestation in rabbits. The results showed that the rPoc-AK protein was ~61 kDa and had no signal peptide. The rPoc-AK-based iELISA achieved a 94.4% sensitivity and a 88.2% specificity, and was able to detect P. ovis var. cuniculi infection as early as the 1st week post-infection, prior to the appearance of clinical signs. Further field study showed 24.94% (66.33/266) clinically normal rabbits were seropositive with the highest and lowest seropositive rates for California (35.71%) and Belgian (15.14%), respectively. These results suggested that the rPoc-AK has potential as a diagnostic antigen for early P. ovis var. cuniculi infestation in rabbits.
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Affiliation(s)
- Xiaobin Gu
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, China
| | - Jiang Gu
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, China
| | - Yongjun Ren
- Institute of Veterinary Pharmacology, Sichuan Animal Science Academy, Chengdu, China.,Animal Breeding and Genetics Key Laboratory of Sichuan Province, Sichuan Animal Science Academy, Chengdu, China
| | - Youle Zheng
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, China
| | - Guangyou Yang
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, China
| | - Xuan Zhou
- Institute of Animal Genetics and Breeding, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, China
| | - Yue Xie
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, China
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Xifeng W, Mengfan Q, Kai Z, Guowu Z, Jing L, Lixia W, Jun Q, Qingling M, Shasha G, Yunfu H, Xuepeng C. Development and evaluation of a colloidal gold immunochromatographic assay based on recombinant protein CatL1D for serodiagnosis of sheep fasciolosis. J Helminthol 2019; 94:e98. [PMID: 31679525 DOI: 10.1017/S0022149X19000919] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Fasciolosis is a zoonotic parasitic disease that seriously endangers the development of animal husbandry and human health. In order to develop a rapid serological diagnostic method for fasciolosis in ruminants, the CatL1D and CatB4 genes of Fasciola hepatica were amplified by reverse transcription polymerase chain reaction (PCR) and cloned, respectively, and then the CatL-B fusion gene (MeCatL-B) was constructed by gene splicing by overlap extension PCR technique. The recombinant rCatL1D, rCatB4 and rMeCatL-B proteins were then prepared by prokaryotic expression, respectively, and the recombinant protein with high specificity and sensitivity was screened via indirect enzyme-linked immunosorbent assay. Using the selected recombinant protein rCatL1D as a diagnostic antigen, we developed a colloidal gold immunochromatographic assay (CGIA) for detecting F. hepatica-specific antibodies, and 426 serum samples of slaughtered sheep were used to evaluate the sensitivity and specificity of F. hepatica CGIA assay. The results showed that the sensitivity and specificity of rCatL1D protein (100%, 96.67%) were higher than those of rCatB4 (94.29%, 80%) and rMeCatL-B (91.43%, 90%). Compared with the gold standard post-mortem inspection, the specificity and sensitivity of the CGIA method was 100% and 97%, respectively, and the consistency rate between these two methods was 99.3%. These results confirmed that the CGIA method based on rCatL1D protein could be a promising approach for rapid diagnosis of sheep fasciolosis because of its high sensitivity and specificity.
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Bhuiyan ZA, Ali MZ, Moula MM, Bary MA, Arefin N, Giasuddin M, Khan ZUM. Seroprevalence of major avian respiratory diseases in broiler and sonali chicken in selected areas of Bangladesh. J Adv Vet Anim Res 2019; 6:561-566. [PMID: 31819887 PMCID: PMC6882717 DOI: 10.5455/javar.2019.f383] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Revised: 09/29/2019] [Accepted: 10/09/2019] [Indexed: 01/06/2023] Open
Abstract
Objective This study was conducted to investigate different respiratory diseases in broiler and sonali birds in some selected districts of Bangladesh. Materials and Methods We were collected a total of 460 blood samples from 46 farms with 36 broiler farms and 10 sonali farms (cross-breed) from 2015 to 2017. All the collected serum samples were tested for determining specific antibodies of avian rhinotracheitis (ART) virus, infectious laryngotracheitis (ILT) virus, infectious bronchitis (IBV) virus, and Ornithobacterium rhinotracheale (ORT) infection using commercially available enzyme-linked immunosorbent assay kits. Results The overall seropositivity was highest in ORT (45.9%), followed by IBV (37.6%), ART (2.6%), and ILT (0.4%). Out of 360 broiler samples, highest seropositivity was recorded in ORT (43.3%) and lowest in IBV (31.4%). Surprisingly, no broiler samples were found positive for ART and ILT. In case of sonali, the seropositivity was highest in IBV (60%) and lowest in ILT (2%). With respect to types of birds and age groups, the seropositive percentage of all four pathogens was found higher in sonali than broiler. Between two age groups of sonali, the seropositive percentage of ART (12%), ORT (55%), ILT (2%), and IBV (60%) was highest at 21-60 weeks of age compared to 5-20 weeks of age. However, based on location, the seropositive of ORT and IBV was highest in Jamalpur (63.3%) and Fulbariya and Trishal (50%) and lowest in Sreepur (16.7%) and Jamalpur (3.3%). Conclusion The four pathogens are ubiquitous in nature for the sonali chickens, and the prevalence of ORT and IBV was the most prevalent viruses in the study areas. This study indicates a need for improved surveillance and characterization of ORT and ART circulating in all types of poultry in Bangladesh.
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Affiliation(s)
- Zafar Ahmed Bhuiyan
- Department of Botany, Jahangirnagar University, Savar, Dhaka1341, Bangladesh.,These two authors contributed equally
| | - Md Zulfekar Ali
- Animal Health Research Division, Bangladesh Livestock Research Institute (BLRI), Savar, Dhaka1341, Bangladesh.,These two authors contributed equally
| | | | - Md Akramul Bary
- Central Poultry Laboratory, Nourish Poultry and Hatchery Ltd., Dhaka, Bangladesh
| | - Nishat Arefin
- Quality Assurance Department, International Beverage Private Limited, Mymensingh, Bangladesh
| | - Md Giasuddin
- Animal Health Research Division, Bangladesh Livestock Research Institute (BLRI), Savar, Dhaka1341, Bangladesh
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Naqvi MA, Naqvi SZ, Memon MA, Aimulajiang K, Haseeb M, Xu L, Song X, Li X, Yan R. Combined Use of Indirect ELISA and Western Blotting with Recombinant Hepatocellular Carcinoma-Associated Antigen 59 Is a Potential Immunodiagnostic Tool for the Detection of Prepatent Haemonchus contortus Infection in Goat. Animals (Basel) 2019; 9:E548. [PMID: 31412573 DOI: 10.3390/ani9080548] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Revised: 08/06/2019] [Accepted: 08/06/2019] [Indexed: 01/05/2023] Open
Abstract
Simple Summary The accurate and early diagnosis of Haemonchus contortus infection is crucial for effective control. Early stage detection of H. contortus infection has not been attempted in goat, even though both immature worm and fourth larval stage are blood sucking. This study was carried out to detect the H. contortus infection during early stage in goat. The results of this study assessed that rHc-HCA59 could detect the antibody in H. contortus infected goats’ sera during early period with good sensitivity and specificity using immunodiagnostic techniques. Our findings illustrated that combined use of ELISA and western blotting based on rHc-HCA59 is a powerful tool for early detection of H. contortus infection in goats. Abstract Haemonchus contortus is recognized as one of the important health problems in small ruminants, leading to reduced production and economic loss for farmers worldwide. Prepatent diagnosis of H. contortus infection is crucial to improve control strategies as this helminth may remove up to one-fifth of total erythrocytes and may cause anemia, edema, diarrhea, and ultimately death in young animals. In this study, one of the excretory and secretory products, rHc-HCA59, was purified and used as antigen to detect specific antibodies in H. contortus infected goats during prepatent stage of infection using indirect enzyme linked immunosorbent assay (ELISA) as screening test. All goats (n = 38) were housed indoor, experimentally infected with 8000 infective larvae (L3) of H. contortus, and serum samples were collected prior to infection and at 14th day of infection. Immunoblotting was performed to confirm the results of indirect ELISA, evaluate the cross reactivity against rHc-HCA59 in sera of most common co-infecting parasites and rectify the false negative samples. Furthermore, three different batches of rHc-HCA59 were produced to evaluate the repeatability of ELISA. No eggs were detected in feces of all goats collected at 7th and 14th day of infection but, H. contortus eggs were detected at 21 days post infection in the feces. Indirect ELISA performed in this study showed 87% sensitivity and 100% specificity. The western blot analysis confirmed immunoreactivity in serum samples which scored positive in indirect ELISA and recognized the samples as negative which had OD450 lower than negative cut-off value in indirect ELISA. Furthermore, all false negative sera (n = 5) that had OD450 value between positive and negative cut-off value in rHc-HCA59 based ELISA were clearly positive in western blot. Moreover, no cross-reactivity was detected in ELISA and western blotting against rHc-HCA59 in positive sera of Toxoplasma gondii, Fasciola hepatica, and Trichinella spiralis. The results of this study concluded that combined use of indirect ELISA and western blotting with rHc-HCA59 is a potential immunodiagnostic tool for the detection of H. contortus infection during prepatent period in goats.
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Tianli L, Xifeng W, Zhenzhong T, Lixia W, Xingxing Z, Jun Q, Qingling M, Shasha G, Ying C, Xuepeng C. Multi-Epitope Fusion Protein Eg mefAg-1 as a Serodiagnostic Candidate for Cystic Echinococcosis in Sheep. Korean J Parasitol 2019; 57:61-67. [PMID: 30840802 PMCID: PMC6409221 DOI: 10.3347/kjp.2019.57.1.61] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Accepted: 01/30/2019] [Indexed: 12/16/2022]
Abstract
Cystic echinococcosis (CE) in sheep is a hazardous zoonotic parasitic disease that is caused by Echinococcus granulosus (Eg). At present, serological test is an important diagnostic method for Eg infection in domestic animals. Here, a fusion protein Eg mefAg-1 harboring 8 dominant B-cell epitopes of Eg such as antigen B, tetraspanin 1, tetraspanin 6, reticulon and Eg95 was produced in E. coli and evaluated for CE in sheep by indirect ELISA. Eg mefAg-1 showed in ELISA a high sensitivity (93.41%) and specificity (99.31%), with a coincidence rate of 97.02%. Overall, it is suggested that the Eg mefAg-1 could be a potential antigen candidate for CE serodiagnosis in sheep.
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Affiliation(s)
- Liu Tianli
- College of Animal Science & Technology, Shihezi University, Shihezi, Xinjiang 832003, China
| | - Wang Xifeng
- College of Animal Science & Technology, Shihezi University, Shihezi, Xinjiang 832003, China
| | - Tian Zhenzhong
- College of Animal Science & Technology, Shihezi University, Shihezi, Xinjiang 832003, China
| | - Wang Lixia
- College of Animal Science & Technology, Shihezi University, Shihezi, Xinjiang 832003, China
| | - Zhang Xingxing
- State Key Laboratory for Sheep Genetic Improvement and Healthy Production, Xinjiang Academy of Agricultural and Reclamation Science, Shihezi, Xinjiang 832000, China
| | - Qiao Jun
- College of Animal Science & Technology, Shihezi University, Shihezi, Xinjiang 832003, China
| | - Meng Qingling
- College of Animal Science & Technology, Shihezi University, Shihezi, Xinjiang 832003, China
| | - Gong Shasha
- College of Animal Science & Technology, Shihezi University, Shihezi, Xinjiang 832003, China
| | - Chen Ying
- College of Animal Science & Technology, Shihezi University, Shihezi, Xinjiang 832003, China
| | - Cai Xuepeng
- State Key Laboratory of Veterinary Etiological Biology, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, Gansu 730046, China
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Wang J, Lei X, Qin P, Zhao P, Wang B, Wang Y, Li Y, Jin H, Li L, Huang YW. [Development and application of real-time RT-PCR and S1 protein-based indirect ELISA for porcine deltacoronavirus]. Sheng Wu Gong Cheng Xue Bao 2018; 33:1265-1275. [PMID: 28853254 DOI: 10.13345/j.cjb.170119] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Porcine deltacoronavirus (PDCoV) has been recently recognized as an emerging viral pathogen that causes diarrhea in newborn piglets. A total of 254 small intestinal or fecal samples collected from 10 provinces including Henan, Hunan, Zhejiang, Jiangxi, Anhui, Hebei, Heilongjiang, Jiangsu, Shandong and Shanghai between 2014 and 2015, were screened by quantitative RT-PCR targeting the viral M gene. Eleven PDCoV positive samples were identified with a total positive rate of 4.33%. An indirect enzyme-linked immunosorbent assay (ELISA) was developed based on the recombinant S1 protein of PDCoV. This assay was used to test 609 serum samples of pigs with diarrhea symptoms collected from 10 provinces between 2015 and 2016. The positive rate of PDCoV antibody was 44.17% (269/609). The two methods can be used to monitor the PDCoV epidemiology in the levels of PDCoV specific RNA or antibody, helping better prevent and control PDCoV.
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Affiliation(s)
- Jingwei Wang
- Institute of Preventive Veterinary Medicine, College of Animal Sciences, Zhejiang University, Hangzhou 310058, Zhejiang, China
| | - Ximei Lei
- Institute of Preventive Veterinary Medicine, College of Animal Sciences, Zhejiang University, Hangzhou 310058, Zhejiang, China
| | - Pan Qin
- Institute of Preventive Veterinary Medicine, College of Animal Sciences, Zhejiang University, Hangzhou 310058, Zhejiang, China
| | - Pengwei Zhao
- Institute of Preventive Veterinary Medicine, College of Animal Sciences, Zhejiang University, Hangzhou 310058, Zhejiang, China
| | - Bin Wang
- Institute of Preventive Veterinary Medicine, College of Animal Sciences, Zhejiang University, Hangzhou 310058, Zhejiang, China
| | - Yiwen Wang
- Institute of Preventive Veterinary Medicine, College of Animal Sciences, Zhejiang University, Hangzhou 310058, Zhejiang, China
| | - Yiting Li
- Institute of Preventive Veterinary Medicine, College of Animal Sciences, Zhejiang University, Hangzhou 310058, Zhejiang, China
| | - Haorui Jin
- Institute of Preventive Veterinary Medicine, College of Animal Sciences, Zhejiang University, Hangzhou 310058, Zhejiang, China
| | - Long Li
- Hangzhou Belta-Biotechnology Co., Ltd., Hangzhou 310004, Zhejiang, China
| | - Yao-Wei Huang
- Institute of Preventive Veterinary Medicine, College of Animal Sciences, Zhejiang University, Hangzhou 310058, Zhejiang, China
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