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Manessis G, Frant M, Podgórska K, Gal-Cisoń A, Łyjak M, Urbaniak K, Woźniakowski G, Denes L, Balka G, Nannucci L, Griol A, Peransi S, Basdagianni Z, Mourouzis C, Giusti A, Bossis I. Label-Free Detection of African Swine Fever and Classical Swine Fever in the Point-of-Care Setting Using Photonic Integrated Circuits Integrated in a Microfluidic Device. Pathogens 2024; 13:415. [PMID: 38787267 PMCID: PMC11124021 DOI: 10.3390/pathogens13050415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2024] [Revised: 05/11/2024] [Accepted: 05/14/2024] [Indexed: 05/25/2024] Open
Abstract
Swine viral diseases have the capacity to cause significant losses and affect the sector's sustainability, a situation further exacerbated by the lack of antiviral drugs and the limited availability of effective vaccines. In this context, a novel point-of-care (POC) diagnostic device incorporating photonic integrated circuits (PICs), microfluidics and information, and communication technology into a single platform was developed for the field diagnosis of African swine fever (ASF) and classical swine fever (CSF). The device targets viral particles and has been validated using oral fluid and serum samples. Sensitivity, specificity, accuracy, precision, positive likelihood ratio (PLR), negative likelihood ratio (NLR), and diagnostic odds ratio (DOR) were calculated to assess the performance of the device, and PCR was the reference method employed. Its sensitivities were 80.97% and 79%, specificities were 88.46% and 79.07%, and DOR values were 32.25 and 14.21 for ASF and CSF, respectively. The proposed POC device and PIC sensors can be employed for the pen-side detection of ASF and CSF, thus introducing novel technological advancements in the field of animal diagnostics. The need for proper validation studies of POC devices is highlighted to optimize animal biosecurity.
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Affiliation(s)
- Georgios Manessis
- Laboratory of Animal Husbandry, Department of Animal Production, School of Agriculture, Faculty of Agriculture, Forestry and Natural Environment, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece; (G.M.); (Z.B.)
| | - Maciej Frant
- Department of Swine Diseases, National Veterinary Research Institute, Partyzantów Avenue 57, 24-100 Puławy, Poland; (M.F.); (K.P.); (A.G.-C.); (M.Ł.); (K.U.)
| | - Katarzyna Podgórska
- Department of Swine Diseases, National Veterinary Research Institute, Partyzantów Avenue 57, 24-100 Puławy, Poland; (M.F.); (K.P.); (A.G.-C.); (M.Ł.); (K.U.)
| | - Anna Gal-Cisoń
- Department of Swine Diseases, National Veterinary Research Institute, Partyzantów Avenue 57, 24-100 Puławy, Poland; (M.F.); (K.P.); (A.G.-C.); (M.Ł.); (K.U.)
| | - Magdalena Łyjak
- Department of Swine Diseases, National Veterinary Research Institute, Partyzantów Avenue 57, 24-100 Puławy, Poland; (M.F.); (K.P.); (A.G.-C.); (M.Ł.); (K.U.)
| | - Kinga Urbaniak
- Department of Swine Diseases, National Veterinary Research Institute, Partyzantów Avenue 57, 24-100 Puławy, Poland; (M.F.); (K.P.); (A.G.-C.); (M.Ł.); (K.U.)
| | - Grzegorz Woźniakowski
- Department of Infectious, Invasive Diseases and Veterinary Administration, Faculty of Biological and Veterinary Sciences, Nicolas Copernicus University in Torun, Lwowska 1, 87-100 Torun, Poland;
| | - Lilla Denes
- Department of Pathology, University of Veterinary Medicine Budapest, Istvan Str. 2, 1078 Budapest, Hungary; (L.D.); (G.B.)
- National Laboratory of Infectious Animal Diseases, Antimicrobial Resistance, Veterinary Public Health and Food Chain Safety, University of Veterinary Medicine, István Str 2., 1078 Budapest, Hungary
| | - Gyula Balka
- Department of Pathology, University of Veterinary Medicine Budapest, Istvan Str. 2, 1078 Budapest, Hungary; (L.D.); (G.B.)
- National Laboratory of Infectious Animal Diseases, Antimicrobial Resistance, Veterinary Public Health and Food Chain Safety, University of Veterinary Medicine, István Str 2., 1078 Budapest, Hungary
| | - Lapo Nannucci
- Dipartimento di Scienze e Tecnologie Agrarie Alimentari Ambientali e Forestali, Università Degli Studi di Firenze, Piazzale delle Cascine 18, 50144 Florence, Italy;
| | - Amadeu Griol
- Nanophotonics Technology Center, Universitat Politècnica de València, Camino de Vera s/n Building 8F, 46022 Valencia, Spain;
| | - Sergio Peransi
- DAS Photonics SL, Camino de Vera, s/n, Building 8F 2nd-Floor, 46022 Valencia, Spain;
| | - Zoitsa Basdagianni
- Laboratory of Animal Husbandry, Department of Animal Production, School of Agriculture, Faculty of Agriculture, Forestry and Natural Environment, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece; (G.M.); (Z.B.)
| | - Christos Mourouzis
- Cyprus Research and Innovation Centre Ltd. (CyRIC), 28th Octovriou Ave 72, Off. 301, Engomi, 2414 Nicosia, Cyprus; (C.M.); (A.G.)
| | - Alessandro Giusti
- Cyprus Research and Innovation Centre Ltd. (CyRIC), 28th Octovriou Ave 72, Off. 301, Engomi, 2414 Nicosia, Cyprus; (C.M.); (A.G.)
| | - Ioannis Bossis
- Laboratory of Animal Husbandry, Department of Animal Production, School of Agriculture, Faculty of Agriculture, Forestry and Natural Environment, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece; (G.M.); (Z.B.)
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Afayibo DJA, Zhang Z, Sun H, Fu J, Zhao Y, Amuda TO, Wu M, Du J, Guan G, Niu Q, Yang J, Yin H. Establishment of an ELISA Based on a Recombinant Antigenic Protein Containing Multiple Prominent Epitopes for Detection of African Swine Fever Virus Antibodies. Microorganisms 2024; 12:943. [PMID: 38792774 PMCID: PMC11124277 DOI: 10.3390/microorganisms12050943] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2024] [Revised: 04/29/2024] [Accepted: 05/02/2024] [Indexed: 05/26/2024] Open
Abstract
African swine fever virus (ASFV) poses a significant threat to the global pig industry, necessitating accurate and efficient diagnostic methods for its infection. Previous studies have often focused on a limited number of epitopes from a few proteins for detecting antibodies against ASFV. Therefore, the current study aimed to use multiple B-cell epitopes in developing an indirect Enzyme-Linked Immunosorbent Assay (ELISA) for enhanced detection of ASFV antibodies. For the expression of recombinant protein, k3 derived from 27 multiple peptides of 11 ASFV proteins, such as p72, pA104R, pB602L, p12, p14.5, p49, pE248R, p30, p54, pp62, and pp220, was used. To confirm the expression of the recombinant protein, we used the Western blotting analysis. The purified recombinant K3 protein served as the antigen in our study, and we employed the indirect ELISA technique to detect anti-ASFV antibodies. The present finding showed that there was no cross-reactivity with antibodies targeting Foot-and-mouth disease virus (FMDV), Porcine circovirus type 2 (PCV2), Pseudorabies virus (PRV), Porcine reproductive and respiratory syndrome virus (PRRSV), and Classical swine fever virus (CSFV). Moreover, the current finding was sensitive enough to find anti-ASFV in serum samples that had been diluted up to 32 times. The test (k3-iELISA) showed diagnostic specificity and sensitivity of 98.41% and 97.40%, respectively. Moreover, during the present investigation, we compared the Ingenasa kit and the k3-iELISA to test clinical pig serum, and the results revealed that there was 99.00% agreement between the two tests, showing good detection capability of the k3-iELISA method. Hence, the current finding showed that the ELISA kit we developed can be used for the rapid detection of ASFV antibodies and used as an alternative during serological investigation of ASF in endemic areas.
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Affiliation(s)
- Dossêh Jean Apôtre Afayibo
- State Key Laboratory for Animal Disease Control and Prevention, African Swine Fever Regional Laboratory of China (Lanzhou), Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Xujiaping 1, Lanzhou 730046, China; (D.J.A.A.); (J.D.)
| | - Zhonghui Zhang
- State Key Laboratory for Animal Disease Control and Prevention, African Swine Fever Regional Laboratory of China (Lanzhou), Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Xujiaping 1, Lanzhou 730046, China; (D.J.A.A.); (J.D.)
| | - Hualin Sun
- State Key Laboratory for Animal Disease Control and Prevention, African Swine Fever Regional Laboratory of China (Lanzhou), Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Xujiaping 1, Lanzhou 730046, China; (D.J.A.A.); (J.D.)
| | - Jingsheng Fu
- State Key Laboratory for Animal Disease Control and Prevention, African Swine Fever Regional Laboratory of China (Lanzhou), Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Xujiaping 1, Lanzhou 730046, China; (D.J.A.A.); (J.D.)
| | - Yaru Zhao
- State Key Laboratory for Animal Disease Control and Prevention, African Swine Fever Regional Laboratory of China (Lanzhou), Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Xujiaping 1, Lanzhou 730046, China; (D.J.A.A.); (J.D.)
| | - Tharheer Oluwashola Amuda
- State Key Laboratory for Animal Disease Control and Prevention, African Swine Fever Regional Laboratory of China (Lanzhou), Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Xujiaping 1, Lanzhou 730046, China; (D.J.A.A.); (J.D.)
| | - Mengli Wu
- State Key Laboratory for Animal Disease Control and Prevention, African Swine Fever Regional Laboratory of China (Lanzhou), Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Xujiaping 1, Lanzhou 730046, China; (D.J.A.A.); (J.D.)
| | - Junzheng Du
- State Key Laboratory for Animal Disease Control and Prevention, African Swine Fever Regional Laboratory of China (Lanzhou), Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Xujiaping 1, Lanzhou 730046, China; (D.J.A.A.); (J.D.)
| | - Guiquan Guan
- State Key Laboratory for Animal Disease Control and Prevention, African Swine Fever Regional Laboratory of China (Lanzhou), Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Xujiaping 1, Lanzhou 730046, China; (D.J.A.A.); (J.D.)
| | - Qingli Niu
- State Key Laboratory for Animal Disease Control and Prevention, African Swine Fever Regional Laboratory of China (Lanzhou), Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Xujiaping 1, Lanzhou 730046, China; (D.J.A.A.); (J.D.)
| | - Jifei Yang
- State Key Laboratory for Animal Disease Control and Prevention, African Swine Fever Regional Laboratory of China (Lanzhou), Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Xujiaping 1, Lanzhou 730046, China; (D.J.A.A.); (J.D.)
| | - Hong Yin
- State Key Laboratory for Animal Disease Control and Prevention, African Swine Fever Regional Laboratory of China (Lanzhou), Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Xujiaping 1, Lanzhou 730046, China; (D.J.A.A.); (J.D.)
- 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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Phillips D, da Conceicao F, Jong JBDC, Rawlin G, Mee P. Stability of Genotube ® Swabs for African Swine Fever Virus Detection Using Loop-Mediated Isothermal (LAMP) Laboratory Testing on Samples Stored without Refrigeration. Viruses 2024; 16:263. [PMID: 38400038 PMCID: PMC10892491 DOI: 10.3390/v16020263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Revised: 01/28/2024] [Accepted: 02/02/2024] [Indexed: 02/25/2024] Open
Abstract
African swine fever (ASF) is a transboundary viral disease which causes high mortality in pigs. In many low- and middle-income countries and in remote areas where diagnostic surveillance for ASF virus (ASFV) is undertaken, access to trained animal health technicians, sample collection, cold chain storage and transport of samples to suitably equipped laboratories can be limiting when traditional sampling and laboratory tests are used. Previously published studies have demonstrated that alternative sampling matrices such as swabs and filter papers can be tested using PCR without refrigeration for up to a week. This study used Genotube® swabs stored in temperate and tropical climates without refrigeration for four weeks after collection to demonstrate there was no change in test performance and results using loop-mediated isothermal amplification (LAMP) ASFV detection on a series of pig serum samples including serum spiked with a synthetic ASFV positive control, naturally acquired ASFV positive serum from Timor-Leste and negative ASFV serum samples. The use of Genotube® swabs for ASFV detection for surveillance purposes, coupled with testing platforms such as LAMP, can provide an alternative to traditional testing methodology where resources are limited and time from collection to testing of samples is prolonged.
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Affiliation(s)
- Dianne Phillips
- Agriculture Victoria, Biosecurity and Agriculture Services, Bairnsdale, VIC 3857, Australia
| | - Felisiano da Conceicao
- Ministry of Agriculture, Livestock, Fisheries and Forestry, Government of Timor-Leste, Av. Nicolao Lobato, Comoro, Dili 0332, Timor-Leste; (F.d.C.); (J.B.d.C.J.)
| | - Joanita Bendita da Costa Jong
- Ministry of Agriculture, Livestock, Fisheries and Forestry, Government of Timor-Leste, Av. Nicolao Lobato, Comoro, Dili 0332, Timor-Leste; (F.d.C.); (J.B.d.C.J.)
| | - Grant Rawlin
- Agriculture Victoria Research, AgriBio Centre for AgriBioscience, Bundoora, VIC 3083, Australia; (G.R.); (P.M.)
| | - Peter Mee
- Agriculture Victoria Research, AgriBio Centre for AgriBioscience, Bundoora, VIC 3083, Australia; (G.R.); (P.M.)
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Li J, Shang MY, Deng SL, Li M, Su N, Ren XD, Sun XG, Li WM, Li YW, Li RX, Huang Q, Lu WP. Development of a novel integrated isothermal amplification system for detection of bacteria-spiked blood samples. AMB Express 2023; 13:135. [PMID: 38019349 PMCID: PMC10686969 DOI: 10.1186/s13568-023-01643-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2022] [Accepted: 11/19/2023] [Indexed: 11/30/2023] Open
Abstract
Bloodstream infection (BSI) caused by bacteria is highly pathogenic and lethal, and easily develops whole-body inflammatory state. Immediate identification of disease-causing bacteria can improve patient prognosis. Traditional testing methods are not only time-consuming, but such tests are limited to laboratories. Recombinase polymerase amplification combined with lateral flow dipstick (RPA-LFD) holds great promise for rapid nucleic acid detection, but the uncapping operation after amplification easily contaminates laboratories. Therefore, the establishment of a more effective integrated isothermal amplification system has become an urgent problem to be solved. In this study, we designed and fabricated a hermetically sealed integrated isothermal amplification system. Combining with this system, a set of RPA-LFD assays for detecting S. aureus, K. peneumoniae, P. aeruginosa, and H. influenza in BSI were established and evaluated. The whole process could be completed in less than 15 min and the results can be visualized by the naked eye. The developed RPA-LFD assays displayed a good sensitivity, and no cross-reactivity was observed in seven similar bacterial genera. The results obtained with 60 clinical samples indicated that the developed RPA-LFD assays had high specifcity and sensitivity for identifying S. aureus, K. peneumoniae, P. aeruginosa, and H. influenza in BSI. In conclusion, our results showed that the developed RPA-LFD assay is an alternative to existing PCR-based methods for detection of S. aureus, K. peneumoniae, P. aeruginosa, and H. influenza in BSI in primary hospitals.
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Affiliation(s)
- Jin Li
- Department of Laboratory Medicine, Daping Hospital, Army Medical University (Third Military Medical University), Chongqing, 400042, P.R. China
| | - Mei-Yun Shang
- Department of Laboratory Medicine, Daping Hospital, Army Medical University (Third Military Medical University), Chongqing, 400042, P.R. China
| | - Shao-Li Deng
- Department of Laboratory Medicine, Daping Hospital, Army Medical University (Third Military Medical University), Chongqing, 400042, P.R. China
| | - Min Li
- Department of Laboratory Medicine, Daping Hospital, Army Medical University (Third Military Medical University), Chongqing, 400042, P.R. China
| | - Ning Su
- Department of Laboratory Medicine, Daping Hospital, Army Medical University (Third Military Medical University), Chongqing, 400042, P.R. China
| | - Xiao-Dong Ren
- Department of Laboratory Medicine, Daping Hospital, Army Medical University (Third Military Medical University), Chongqing, 400042, P.R. China
| | - Xian-Ge Sun
- Department of Laboratory Medicine, Daping Hospital, Army Medical University (Third Military Medical University), Chongqing, 400042, P.R. China
| | - Wen-Man Li
- Department of Laboratory Medicine, Daping Hospital, Army Medical University (Third Military Medical University), Chongqing, 400042, P.R. China
| | - Yu-Wei Li
- Department of Laboratory Medicine, Daping Hospital, Army Medical University (Third Military Medical University), Chongqing, 400042, P.R. China
| | - Ruo-Xu Li
- Department of Laboratory Medicine, Daping Hospital, Army Medical University (Third Military Medical University), Chongqing, 400042, P.R. China
| | - Qing Huang
- Department of Laboratory Medicine, Daping Hospital, Army Medical University (Third Military Medical University), Chongqing, 400042, P.R. China.
| | - Wei-Ping Lu
- Department of Laboratory Medicine, Daping Hospital, Army Medical University (Third Military Medical University), Chongqing, 400042, P.R. China.
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Homklinkaew P, Phatthanakunanan S, Jala S, Boonsoongnern A, Lertwatcharasarakul P. Development of a recombinase-aided amplification method combined with lateral flow dipstick assay to detect Porcine circovirus type 2. Vet World 2023; 16:2313-2320. [PMID: 38152256 PMCID: PMC10750741 DOI: 10.14202/vetworld.2023.2313-2320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Accepted: 10/16/2023] [Indexed: 12/29/2023] Open
Abstract
Background and Aim Porcine circovirus type 2 (PCV2) is a pathogenic virus that suppresses the immune system of pigs, impacting their health and causing economic losses. Rapid diagnostic tools for early detection of PCV2 are critical to disease prevention and control. Several molecular techniques have been established for detecting PCV2 but costly equipment and time-consuming methods are unsuitable for field inspection. In this study, we developed a recombinase-aided amplification combined with lateral flow dipstick (RAA-LFD) assay to compare with polymerase chain reaction (PCR) and quantitative PCR (qPCR) in detecting PCV2 in suspected field samples. Materials and Methods To amplify RAA products, 15 primer pairs were designed from the conserved region of the open reading frame (ORF) 1 gene based on multiple alignments of eight PCV2 genotypes. The most efficient primer pair and conditions for the RAA-LFD assay were tested and selected. Limit of detection, repeatability, and reproducibility were determined using the constructed plasmid. DNA was extracted from positive samples for specificity testing as well as from 100 field samples to compare the detection of the RAA-LFD assay with PCR and qPCR. Results The F1/R1 primer pair was chosen and labeled with fluorescein isothiocyanate at the 5' end of the forward primer and with biotin at the 5' end of the reverse primer. The limit of detection of the RAA-LFD assay was 10 copies/μL at 38°C for 30 min. The RAA-LFD assay was repeatable and reproducible, with no cross-reaction with PCV3, Actinobacillus pleuropneumoniae, Porcine epidemic diarrhea virus, Classical swine fever virus, Porcine reproductive and respiratory syndrome virus - North America strain (PRRSV-US) and Porcine reproductive and respiratory syndrome virus - European strain (PRRSV-EU). Based on testing with 100 samples, the developed RAA showed 100% specificity and 90.56% and 85.71% sensitivity when compared to PCR and qPCR, respectively Cohen's kappa coefficients showed a good agreement with the established techniques. Conclusion The RAA-LFD assay targeting the ORF1 gene was highly sensitive, specific, quick, and simple to perform in the field.
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Affiliation(s)
- Ploypassorn Homklinkaew
- Animal Health and Biomedical Sciences Study Program, Faculty of Veterinary Medicine, Kasetsart University, Bangkok 10900, Thailand
| | - Sakuna Phatthanakunanan
- Kamphaeng Saen Veterinary Diagnostic Center, Faculty of Veterinary Medicine, Kasetsart University, Nakorn Pathom 73140, Thailand
| | - Siriluk Jala
- Kamphaeng Saen Veterinary Diagnostic Center, Faculty of Veterinary Medicine, Kasetsart University, Nakorn Pathom 73140, Thailand
| | - Alongkot Boonsoongnern
- Department of Farm Resources and Production Medicine, Faculty of Veterinary Medicine, Kasetsart University, Nakorn Pathom 73140, Thailand
| | - Preeda Lertwatcharasarakul
- Department of Pathology, Faculty of Veterinary Medicine, Kasetsart University, Nakorn Pathom 73140, Thailand
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Innovative Research Offers New Hope for Managing African Swine Fever Better in Resource-Limited Smallholder Farming Settings: A Timely Update. Pathogens 2023; 12:pathogens12020355. [PMID: 36839627 PMCID: PMC9963711 DOI: 10.3390/pathogens12020355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Revised: 02/17/2023] [Accepted: 02/19/2023] [Indexed: 02/23/2023] Open
Abstract
African swine fever (ASF) in domestic pigs has, since its discovery in Africa more than a century ago, been associated with subsistence pig keeping with low levels of biosecurity. Likewise, smallholder and backyard pig farming in resource-limited settings have been notably affected during the ongoing epidemic in Eastern Europe, Asia, the Pacific, and Caribbean regions. Many challenges to managing ASF in such settings have been identified in the ongoing as well as previous epidemics. Consistent implementation of biosecurity at all nodes in the value chain remains most important for controlling and preventing ASF. Recent research from Asia, Africa, and Europe has provided science-based information that can be of value in overcoming some of the hurdles faced for implementing biosecurity in resource-limited contexts. In this narrative review we examine a selection of these studies elucidating innovative solutions such as shorter boiling times for inactivating ASF virus in swill, participatory planning of interventions for risk mitigation for ASF, better understanding of smallholder pig-keeper perceptions and constraints, modified culling, and safe alternatives for disposal of carcasses of pigs that have died of ASF. The aim of the review is to increase acceptance and implementation of science-based approaches that increase the feasibility of managing, and the possibility to prevent, ASF in resource-limited settings. This could contribute to protecting hundreds of thousands of livelihoods that depend upon pigs and enable small-scale pig production to reach its full potential for poverty alleviation and food security.
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Development and Evaluation of Duplex MIRA-qPCR Assay for Simultaneous Detection of Staphylococcus aureus and non-aureus Staphylococci. Microorganisms 2022; 10:microorganisms10091734. [PMID: 36144336 PMCID: PMC9502308 DOI: 10.3390/microorganisms10091734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Revised: 08/22/2022] [Accepted: 08/24/2022] [Indexed: 11/24/2022] Open
Abstract
Staphylococcus spp., especially Staphylococcus aureus (S. aureus), is an important pathogen in hospital-acquired infection and food poisoning. Here, we developed a multienzyme isothermal rapid amplification combined with duplex quantitative PCR (duplex MIRA-qPCR) method, which can simultaneously detect the S. aureus species-specific conserved gene FMN-bgsfp and the Staphylococcus genus-specific conserved gene tuf. This assay enabled the amplification of DNA within 20 min at a constant temperature of 39 °C. Specificity analysis indicated that all nine common Staphylococcus species were positive and non-Staphylococcus spp. were negative for tuf gene, whereas S. aureus was positive, non-aureus Staphylococci species and non-Staphylococcus spp. were negative for FMN-bgsfp gene, suggesting that duplex MIRA-qPCR exhibited high specificity. Meanwhile, the sensitivity was tested and the limit of detection (LoD) was 3 × 102 CFU/mL. The coefficient variation values ranged from 0.13% to 2.09%, indicating that the assay had good repeatability. Furthermore, all the nine common Staphylococcus species (including S. aureus) could be detected from four kinds of simulated samples and the LoD of S. aureus was 8.56 × 103 CFU/mL. In conclusion, the duplex MIRA-qPCR has advantages of stronger specificity, lower detection threshold, shorter detection time, and simpler operation, which is an effective tool to detect S. aureus and non-aureus Staphylococci spp. infections rapidly.
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Wu X, Chu F, Zhang L, Chen S, Gao L, Zhang H, Huang H, Wang J, Chen M, Xie Z, Chen F, Zhang X, Xie Q. New rapid detection by using a constant temperature method for avian leukosis viruses. Front Microbiol 2022; 13:968559. [PMID: 36060773 PMCID: PMC9433894 DOI: 10.3389/fmicb.2022.968559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Accepted: 07/28/2022] [Indexed: 11/17/2022] Open
Abstract
The avian leukemia virus causes avian leukemia (AL), a severe immunosuppressive disease in chickens (ALV). Since the 1990s, the diversity of ALV subpopulations caused by ALV genome variation and recombination, and the complexity of the infection and transmission, with currently no effective commercial vaccine and therapeutic for ALV, has resulted in severe economic losses to the chicken business in various parts of the world. Therefore, as a key means of prevention and control, an effective, rapid, and accurate detection method is imperative. A new real-time reverse transcription recombinase-aided amplification (RT-RAA) assay for ALV with rapid, highly specific, low-cost, and simple operational characteristics have been developed in this study. Based on the amplification of 114 base pairs from the ALV P12 gene, real-time RT-RAA primers and a probe were designed for this study. The lowest detection line was 10 copies of ALV RNA molecules per response, which could be carried out at 39°C in as fastest as 5 min and completed in 30 min, with no cross-reactivity with Marek's disease virus, avian reticuloendothelial virus, Newcastle disease virus, infectious bronchitis virus, infectious bursal disease virus, infectious laryngotracheitis virus, and avian influenza virus. Furthermore, the kappa value of 0.91 (>0.81) was compared with reverse transcription–polymerase chain reaction (RT-PCR) for 44 clinical samples, and the coefficients of variation were within 5.18% of the repeated assays with three low-level concentration gradients. These results indicate that using a real-time RT-RAA assay to detect ALV could be a valuable method.
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Affiliation(s)
- Xiuhong Wu
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology and Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
- Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou, China
- South China Collaborative Innovation Center for Poultry Disease Control and Product Safety, Guangzhou, China
| | - Fengsheng Chu
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology and Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
- Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou, China
- South China Collaborative Innovation Center for Poultry Disease Control and Product Safety, Guangzhou, China
| | - Luxuan Zhang
- School of Pharmaceutical Science, Sun Yat-sen University, Guangzhou, China
| | - Sheng Chen
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology and Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
- Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou, China
- South China Collaborative Innovation Center for Poultry Disease Control and Product Safety, Guangzhou, China
| | - Liguo Gao
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology and Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
- Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou, China
- South China Collaborative Innovation Center for Poultry Disease Control and Product Safety, Guangzhou, China
| | - Hao Zhang
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology and Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
- Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou, China
| | - Haohua Huang
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology and Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
- Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou, China
| | - Jin Wang
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology and Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
- Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou, China
| | - Mengjun Chen
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology and Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
- Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou, China
| | - Zi Xie
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology and Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
- Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou, China
- South China Collaborative Innovation Center for Poultry Disease Control and Product Safety, Guangzhou, China
| | - Feng Chen
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology and Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
- Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou, China
- South China Collaborative Innovation Center for Poultry Disease Control and Product Safety, Guangzhou, China
| | - Xinheng Zhang
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology and Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
- Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou, China
- South China Collaborative Innovation Center for Poultry Disease Control and Product Safety, Guangzhou, China
- *Correspondence: Xinheng Zhang
| | - Qingmei Xie
- Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology and Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China
- Guangdong Engineering Research Center for Vector Vaccine of Animal Virus, Guangzhou, China
- South China Collaborative Innovation Center for Poultry Disease Control and Product Safety, Guangzhou, China
- Qingmei Xie
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9
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Development of a p72 trimer-based colloidal gold strip for detection of antibodies against African swine fever virus. Appl Microbiol Biotechnol 2022; 106:2703-2714. [PMID: 35291024 PMCID: PMC8923092 DOI: 10.1007/s00253-022-11851-z] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Revised: 02/22/2022] [Accepted: 02/26/2022] [Indexed: 11/24/2022]
Abstract
Abstract African swine fever virus (ASFV) causes a highly contagious and often lethal swine viral disease, and leads to tremendous economic losses to the swine industry. Unfortunately, there are no vaccines and effective antiviral agents available to prevent and control ASFV outbreaks. Therefore, it is necessary to develop simple and rapid strategies to monitor ASFV-infected pigs to restrain its spread. In the current study, ASFV capsid protein p72 was expressed along with its chaperone pB602L to form trimers in human embryonic kidney 293 (HEK293) cells. The p72 trimers were subsequently labeled with colloidal gold to develop a immunochromatographic strip. The strip showed high specificity to ASFV-positive serum and no cross-reactivity to other swine virus positive sera. Importantly, the strip showed a higher sensitivity of detecting ASFV antibodies in both positive standard serum and clinical serum samples than a commercial enzyme-linked immunosorbent assay (ELISA) kit. Taken together, these results demonstrate the strip as a reliable diagnostic tool against ASFV infection, which will be appropriate for application in prevention and control of ASFV. Key points • ASFV p72 trimers were successfully generated. • A colloidal gold strip was developed based on ASFV p72 trimers. • The strip is appropriate for detecting ASFV antibodies in the field.
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10
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Wang H, Zhang Y, Zhou J, Li M, Chen Y, Liu Y, Liu H, Ding P, Liang C, Zhu X, Zhang Y, Xin C, Zhang G, Wang A. Rapid Visual Detection of Hepatitis C Virus Using Reverse Transcription Recombinase-Aided Amplification–Lateral Flow Dipstick. Front Cell Infect Microbiol 2022; 12:816238. [PMID: 35252031 PMCID: PMC8892114 DOI: 10.3389/fcimb.2022.816238] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Accepted: 01/17/2022] [Indexed: 12/16/2022] Open
Abstract
Hepatitis C virus (HCV) infection is a global public health threat. Reaching the World Health Organization’s objective for eliminating viral hepatitis by 2030 will require a precise disease diagnosis. While immunoassays and qPCR play a significant role in detecting HCV, rapid and accurate point-of-care testing is important for pathogen identification. This study establishes a reverse transcription recombinase-aided amplification–lateral flow dipstick (RT-RAA-LFD) assay to detect HCV. The intact workflow was completed within 30 min, and the detection limit for synthesized C/E1 plasmid gene-containing plasmid was 10 copies/μl. In addition, the test showed good specificity, with no cross-reactivity observed for hepatitis A virus, hepatitis B virus, HIV, syphilis, and human papillomavirus virus. Using extracted RNAs from 46 anti-HCV antibody-positive samples, RT-RAA-LFD showed 100% positive and negative concordance rates with qPCR. In summary, the RT-RAA-LFD assay established in this study is suitable for the rapid clinical detection of HCV at the community level and in remote areas.
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Affiliation(s)
- Haili Wang
- School of Life Sciences, Zhengzhou University, Zhengzhou, China
| | - Yuhang Zhang
- College of Veterinary Medicine, Henan Agricultural University, Zhengzhou, China
| | - Jingming Zhou
- School of Life Sciences, Zhengzhou University, Zhengzhou, China
| | - Ming Li
- Henan Key Laboratory of Population Defects Prevention, National Health Commission Key Laboratory of Birth Defects Prevention, Henan Institute of Reproduction Health Science and Technology, Zhengzhou, China
| | - Yumei Chen
- School of Life Sciences, Zhengzhou University, Zhengzhou, China
| | - Yankai Liu
- School of Life Sciences, Zhengzhou University, Zhengzhou, China
| | - Hongliang Liu
- School of Life Sciences, Zhengzhou University, Zhengzhou, China
| | - Peiyang Ding
- School of Life Sciences, Zhengzhou University, Zhengzhou, China
| | - Chao Liang
- School of Life Sciences, Zhengzhou University, Zhengzhou, China
| | - Xifang Zhu
- School of Life Sciences, Zhengzhou University, Zhengzhou, China
| | - Ying Zhang
- School of Life Sciences, Zhengzhou University, Zhengzhou, China
| | - Cheng Xin
- School of Life Sciences, Zhengzhou University, Zhengzhou, China
| | - Gaiping Zhang
- School of Life Sciences, Zhengzhou University, Zhengzhou, China
- College of Veterinary Medicine, Henan Agricultural University, Zhengzhou, China
- *Correspondence: Gaiping Zhang, ; Aiping Wang,
| | - Aiping Wang
- School of Life Sciences, Zhengzhou University, Zhengzhou, China
- *Correspondence: Gaiping Zhang, ; Aiping Wang,
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11
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Onyilagha C, Nguyen K, Luka PD, Hussaini U, Adedeji A, Odoom T, Ambagala A. Evaluation of a Lateral Flow Assay for Rapid Detection of African Swine Fever Virus in Multiple Sample Types. Pathogens 2022; 11:pathogens11020138. [PMID: 35215082 PMCID: PMC8877915 DOI: 10.3390/pathogens11020138] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 01/16/2022] [Accepted: 01/19/2022] [Indexed: 11/28/2022] Open
Abstract
Antibody-based lateral flow assay (LFA) is a quick and inexpensive tool used to detect pathogens in field samples, especially in hard-to-reach remote areas that may have limited access to central laboratories during an outbreak or surveillance. In this study, we investigated the ability of a commercially available LFA, PenCheck®, to detect African swine fever virus (ASFV) in clinical samples derived from pigs infected with highly virulent ASFV strains. The assay was specific and positively identified the majority of pigs showing high fever during the early stages (between 3 and 5 days) of infection. PenCheck® LFA also detected ASFV in serum and tissue samples collected from pigs that succumbed to experimental ASFV infection and whole blood, plasma, and tissue samples from the field. The limit of detection of the assay was ASFV titer 107.80 TCID50/mL, corresponding to ASFV real-time PCR values below 23 Ct. Although the sensitivity of the assay is less than that of the laboratory-based real-time PCR assays, the results obtained with the PenCheck® LFA in this study suggest that it can be used as a herd-level, field-deployable, and easy-to-use diagnostic tool to identify ASF-affected farms when access to portable molecular assays or central laboratories is not possible.
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Affiliation(s)
- Chukwunonso Onyilagha
- National Centre for Foreign Animal Disease, Canadian Food Inspection Agency, Winnipeg, MB R3E 3M4, Canada; (C.O.); (K.N.)
| | - Kelvin Nguyen
- National Centre for Foreign Animal Disease, Canadian Food Inspection Agency, Winnipeg, MB R3E 3M4, Canada; (C.O.); (K.N.)
| | - Pam D. Luka
- Virology Division, National Veterinary Research Institute, P.M.B 01, Vom 930001, Plateau, Nigeria; (P.D.L.); (U.H.); (A.A.)
| | - Ularamu Hussaini
- Virology Division, National Veterinary Research Institute, P.M.B 01, Vom 930001, Plateau, Nigeria; (P.D.L.); (U.H.); (A.A.)
| | - Adeyinka Adedeji
- Virology Division, National Veterinary Research Institute, P.M.B 01, Vom 930001, Plateau, Nigeria; (P.D.L.); (U.H.); (A.A.)
| | - Theophilus Odoom
- Accra Laboratory, Veterinary Services Directorate, Accra P.O. Box M161, Ghana;
| | - Aruna Ambagala
- National Centre for Foreign Animal Disease, Canadian Food Inspection Agency, Winnipeg, MB R3E 3M4, Canada; (C.O.); (K.N.)
- Department of Comparative Biology, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB T2N 1N4, Canada
- Correspondence: ; Tel.: +1-204-789-2013
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12
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Wang W, Zhou L, Ge X, Han J, Guo X, Chen Y, Zhang Y, Yang H. Development of a VP2-based real-time fluorescent reverse transcription recombinase-aided amplification assay to rapidly detect Senecavirus A. Transbound Emerg Dis 2021; 69:2828-2839. [PMID: 34931455 DOI: 10.1111/tbed.14435] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Revised: 12/01/2021] [Accepted: 12/14/2021] [Indexed: 01/28/2023]
Abstract
Senecavirus A (SVA), a newly emergent picornavirus correlated with sudden neonatal mortality and vesicular lesions in pigs, has had a considerable impact on the global pig farming industry. Timely and dependable detection of SVA is helpful in preventing the further spread of this pathogenic virus. In the current study, a real-time fluorescent reverse transcription recombinase-aided amplification (rRT-RAA) assay, which targets the most conserved region within the VP2 gene of SVA, was developed and evaluated for SVA detection. The detection limit for this assay was tested to be 1.185 50% tissue culture infective dose (TCID50 ) of SVA RNA per reaction at a 95% confidence interval, which is comparable to that of a previously published rRT-PCR assay for SVA. The testing results of the rRT-RAA assay were very reproducible and repeatable, with inter- and intra-assay coefficient of variation values less than 7.0%. In addition, the established rRT-RAA assay displayed excellent specificity for SVA detection without cross-reaction with other clinically important swine pathogenic viruses. The diagnostic performance of rRT-RAA was evaluated using 189 clinical swine samples, which were detected in parallel using the reference rRT-PCR assay. The results showed that 146 and 151 samples tested positive for SVA by rRT-RAA and rRT-PCR, respectively. The overall agreement between both assays was 97.4% (184/189) with a kappa value of 0.927 (p < .001). Further linear regression analysis demonstrated that the detection results between the two assays were significantly correlated (R2 = 0.9192, p < .0001). Taken together, our newly established rRT-RAA assay is a powerful and time-saving diagnostic tool for SVA detection in clinical samples. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Wenlong Wang
- Key Laboratory of Animal Epidemiology of Ministry of Agriculture and Rural Affairs, College of Veterinary Medicine, China Agricultural University, Beijing, 100193, P.R. China
| | - Lei Zhou
- Key Laboratory of Animal Epidemiology of Ministry of Agriculture and Rural Affairs, College of Veterinary Medicine, China Agricultural University, Beijing, 100193, P.R. China
| | - Xinna Ge
- Key Laboratory of Animal Epidemiology of Ministry of Agriculture and Rural Affairs, College of Veterinary Medicine, China Agricultural University, Beijing, 100193, P.R. China
| | - Jun Han
- Key Laboratory of Animal Epidemiology of Ministry of Agriculture and Rural Affairs, College of Veterinary Medicine, China Agricultural University, Beijing, 100193, P.R. China
| | - Xin Guo
- Key Laboratory of Animal Epidemiology of Ministry of Agriculture and Rural Affairs, College of Veterinary Medicine, China Agricultural University, Beijing, 100193, P.R. China
| | - Yanhong Chen
- Key Laboratory of Animal Epidemiology of Ministry of Agriculture and Rural Affairs, College of Veterinary Medicine, China Agricultural University, Beijing, 100193, P.R. China
| | - Yongning Zhang
- Key Laboratory of Animal Epidemiology of Ministry of Agriculture and Rural Affairs, College of Veterinary Medicine, China Agricultural University, Beijing, 100193, P.R. China
| | - Hanchun Yang
- Key Laboratory of Animal Epidemiology of Ministry of Agriculture and Rural Affairs, College of Veterinary Medicine, China Agricultural University, Beijing, 100193, P.R. China
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13
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Wang XF, Chen WQ, Guo JL, Peng C, Chen XY, Xu XL, Wei W, Yang L, Ca J, Xu JF. A Fast, Visual, and Instrument-free Platform Involving Rapid DNA Extraction, Chemical Heating, and Recombinase Aided Amplification for On-Site Nucleic Acid Detection. Front Bioeng Biotechnol 2021; 9:764306. [PMID: 34881235 PMCID: PMC8645684 DOI: 10.3389/fbioe.2021.764306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Accepted: 11/04/2021] [Indexed: 11/25/2022] Open
Abstract
The nucleic acid-based technique has been widely utilized in many fields including for on-site detection. However, traditional molecular detection techniques encounter limitations like relying on instruments, time consuming or complex operation, and cannot meet the demands of on-site testing. In this study, a rapid DNA extraction method (RDEM), recombinase aided amplification (RAA), and chemical heating packet (CHP) are integrated and termed as RRC platform for on-site detection of nucleic acid. For demonstration purposes, SHZD32-1 (a new transgenic soybean line from China) was detected using the novel platform to demonstrate its feasibility and capability for on-site detection. Using the RDEM, high-quality DNA appropriate for molecular detection was quickly extracted in 3–5 min. The heat energy generated by CHP was met the temperature requirements of RAA. Using the RRC platform, the whole detection process can be accomplished within only 30 min, and the results can be visually detected with glasses under blue light. No special or expensive instrument was needed for the detection process. This study provides a novel approach for on-site detection of nucleic acids besides providing valuable insight on related future research.
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Affiliation(s)
- Xiao Fu Wang
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Zhejiang Academy of Agricultural Sciences, Hangzhou, China.,Key Laboratory of Information Traceability for Agricultural Products, Ministry of Agriculture of China, Hangzhou, China
| | - Wen Qiang Chen
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Zhejiang Academy of Agricultural Sciences, Hangzhou, China.,College of Biological and Food Engineering, Fuyang Normal University, Fuyang, China
| | - Jian Li Guo
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Cheng Peng
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Zhejiang Academy of Agricultural Sciences, Hangzhou, China.,Key Laboratory of Information Traceability for Agricultural Products, Ministry of Agriculture of China, Hangzhou, China
| | - Xiao Yun Chen
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Zhejiang Academy of Agricultural Sciences, Hangzhou, China.,Key Laboratory of Information Traceability for Agricultural Products, Ministry of Agriculture of China, Hangzhou, China
| | - Xiao Li Xu
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Zhejiang Academy of Agricultural Sciences, Hangzhou, China.,Key Laboratory of Information Traceability for Agricultural Products, Ministry of Agriculture of China, Hangzhou, China
| | - Wei Wei
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Lei Yang
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Jian Ca
- College of Biological and Food Engineering, Fuyang Normal University, Fuyang, China
| | - Jun Feng Xu
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Zhejiang Academy of Agricultural Sciences, Hangzhou, China.,Key Laboratory of Information Traceability for Agricultural Products, Ministry of Agriculture of China, Hangzhou, China
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14
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Ceruti A, Kobialka RM, Ssekitoleko J, Okuni JB, Blome S, Abd El Wahed A, Truyen U. Rapid Extraction and Detection of African Swine Fever Virus DNA Based on Isothermal Recombinase Polymerase Amplification Assay. Viruses 2021; 13:v13091731. [PMID: 34578312 PMCID: PMC8472937 DOI: 10.3390/v13091731] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 08/23/2021] [Accepted: 08/26/2021] [Indexed: 11/16/2022] Open
Abstract
African swine fever virus (ASFV) is the causative agent of a deadly disease in pigs and is spread rapidly across borders. Samples collected from suspected cases must be sent to the reference laboratory for diagnosis using polymerase chain reaction (PCR). In this study, we aimed to develop a simple DNA isolation step and real-time recombinase polymerase amplification (RPA) assay for rapid detection of ASFV. RPA assay based on the p72 encoding B646L gene of ASFV was established. The assays limit of detection and cross-reactivity were investigated. Diagnostic performance was examined using 73 blood and serum samples. Two extraction approaches were tested: silica-column-based extraction method and simple non-purification DNA isolation (lysis buffer and heating, 70 °C for 20 min). All results were compared with well-established real-time PCR. In a field deployment during a disease outbreak event in Uganda, 20 whole blood samples were tested. The assay’s analytical sensitivity was 3.5 DNA copies of molecular standard per µL as determined by probit analysis on eight independent assay runs. The ASFV RPA assay only detected ASFV genotypes. Compared to real-time PCR, RPA diagnostic sensitivity and specificity were 100%. Using the heating/lysis buffer extraction procedure, ASFV-RPA revealed better tolerance to inhibitors than real-time PCR (97% and 38% positivity rate, respectively). In Uganda, infected animals were identified before the appearance of fever. The ASFV-RPA assay is shown to be as sensitive and specific as real-time PCR. Moreover, the combination of the simple extraction protocol allows its use at the point of need to improve control measures.
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Affiliation(s)
- Arianna Ceruti
- Institute of Animal Hygiene and Veterinary Public Health, Leipzig University, 04103 Leipzig, Germany; (A.C.); (R.M.K.); (U.T.)
| | - Rea Maja Kobialka
- Institute of Animal Hygiene and Veterinary Public Health, Leipzig University, 04103 Leipzig, Germany; (A.C.); (R.M.K.); (U.T.)
| | - Judah Ssekitoleko
- College of Veterinary Medicine, Animal Resources and Biosecurity (COVAB), Makerere University, Kampala P.O. Box 7062, Uganda; (J.S.); (J.B.O.)
- National Agricultural Research Organisation, Entebbe P.O. Box 295, Uganda
| | - Julius Boniface Okuni
- College of Veterinary Medicine, Animal Resources and Biosecurity (COVAB), Makerere University, Kampala P.O. Box 7062, Uganda; (J.S.); (J.B.O.)
| | - Sandra Blome
- Friedrich-Loeffler-Institut, Institute of Diagnostic Virology, 17493 Greifswald, Germany;
| | - Ahmed Abd El Wahed
- Institute of Animal Hygiene and Veterinary Public Health, Leipzig University, 04103 Leipzig, Germany; (A.C.); (R.M.K.); (U.T.)
- Correspondence:
| | - Uwe Truyen
- Institute of Animal Hygiene and Veterinary Public Health, Leipzig University, 04103 Leipzig, Germany; (A.C.); (R.M.K.); (U.T.)
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