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Hao J, Jia M, Liu Y, Lv Z, Chen J, Xiong W, Zeng Z. Application of a rapid and sensitive RPA-CRISPR/Cas12a assay for naked-eye detection of Haemophilus parasuis. Anal Chim Acta 2024; 1287:342101. [PMID: 38182383 DOI: 10.1016/j.aca.2023.342101] [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: 08/08/2023] [Revised: 11/27/2023] [Accepted: 11/29/2023] [Indexed: 01/07/2024]
Abstract
BACKGROUND Haemophilus parasuis (H. parasuis) is a gram-negative bacterial pathogen that causes severe infections in swine, resulting in substantial economic losses. Currently, the majority of H. parasuis detection methods are impractical for on-site application due to their reliance on large instruments or complex procedures. Thus, there is an urgent need to develop a rapid, visually detectable, and highly sensitive detection method, especially under resource-limited environments and field conditions. RESULTS In this study, we established a naked eye assay for highly sensitive detection by combining recombinase polymerase amplification (RPA) with CRISPR/Cas12a technology. Positive samples exhibited a clear red color visible to the naked eye, while negative samples appeared blue. We achieved a remarkable sensitivity, detecting H. parasuis down to a single copy, with no cross-reactivity with other bacteria. In a mouse model, our assay detected H. parasuis infection nearly 8 h earlier than traditional PCR. Compared to qPCR, our detection results were 100 % accurate. To enhance point-of-care applicability and mitigate the risk of aerosol contamination from uncapping, we consolidated RPA and CRISPR/Cas12a cleavage into a single-tube reaction system. This integrated approach was validated with 20 clinical lung samples, yielding results consistent with those obtained from qPCR. The entire procedure, from DNA extraction to detection, was completed in 35 min. SIGNIFICANCE We present an RPA-CRISPR/Cas12a assay suitable for the early and resource-efficient diagnosis of H. parasuis infections. Its simplicity and visual detection are advantageous for field diagnostics, representing a substantial develpoment in the diagnosis of H. parasuis.
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Affiliation(s)
- Jie Hao
- Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development and Safety Evaluation, South China Agricultural University, Guangzhou, 510642, China; National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510642, China; National Laboratory of Safety Evaluation (Environmental Assessment) of Veterinary Drugs, South China Agricultural University, Guangzhou, 510642, China
| | - Mengyan Jia
- Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development and Safety Evaluation, South China Agricultural University, Guangzhou, 510642, China; National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510642, China; National Laboratory of Safety Evaluation (Environmental Assessment) of Veterinary Drugs, South China Agricultural University, Guangzhou, 510642, China
| | - Yiting Liu
- Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development and Safety Evaluation, South China Agricultural University, Guangzhou, 510642, China; National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510642, China; National Laboratory of Safety Evaluation (Environmental Assessment) of Veterinary Drugs, South China Agricultural University, Guangzhou, 510642, China
| | - Zhenlin Lv
- Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development and Safety Evaluation, South China Agricultural University, Guangzhou, 510642, China; National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510642, China; National Laboratory of Safety Evaluation (Environmental Assessment) of Veterinary Drugs, South China Agricultural University, Guangzhou, 510642, China
| | - Junming Chen
- Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development and Safety Evaluation, South China Agricultural University, Guangzhou, 510642, China; National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510642, China; National Laboratory of Safety Evaluation (Environmental Assessment) of Veterinary Drugs, South China Agricultural University, Guangzhou, 510642, China
| | - Wenguang Xiong
- Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development and Safety Evaluation, South China Agricultural University, Guangzhou, 510642, China; National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510642, China; National Laboratory of Safety Evaluation (Environmental Assessment) of Veterinary Drugs, South China Agricultural University, Guangzhou, 510642, China; National Reference Laboratory of Veterinary Drug Residues, South China Agricultural University, Guangzhou, 510642, China.
| | - Zhenling Zeng
- Guangdong Provincial Key Laboratory of Veterinary Pharmaceutics Development and Safety Evaluation, South China Agricultural University, Guangzhou, 510642, China; National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510642, China; National Laboratory of Safety Evaluation (Environmental Assessment) of Veterinary Drugs, South China Agricultural University, Guangzhou, 510642, China; National Reference Laboratory of Veterinary Drug Residues, South China Agricultural University, Guangzhou, 510642, China.
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Liu G, Wang K, Yang Z, Tang X, Chang YF, Dai K, Tang X, Hu B, Zhang Y, Cao S, Huang X, Yan Q, Wu R, Zhao Q, Du S, Wen X, Wen Y. Identification of a Novel Linear B-Cell Epitope of HbpA Protein from Glaesserella parasuis Using Monoclonal Antibody. Int J Mol Sci 2023; 24:8638. [PMID: 37239984 PMCID: PMC10218323 DOI: 10.3390/ijms24108638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Revised: 04/27/2023] [Accepted: 04/27/2023] [Indexed: 05/28/2023] Open
Abstract
Glaesserella parasuis (G. parasuis.) is the etiological pathogen of Glässer's disease, which causes high economic losses to the pig industry. The heme-binding protein A precursor (HbpA) was a putative virulence-associated factor proposed to be potential subunit vaccine candidate in G. parasuis. In this study, three monoclonal antibodies (mAb) 5D11, 2H81, and 4F2 against recombinant HbpA (rHbpA) of G. parasuis SH0165 (serotype 5) were generated by fusing SP2/0-Ag14 murine myeloma cells and spleen cells from BALB/c mice immunized with the rHbpA. Indirect enzyme-linked immunosorbent assay (ELISA) and indirect immunofluorescence assay (IFA) demonstrated that the antibody designated 5D11 showed a strong binding affinity with the HbpA protein and was chosen for subsequent experiments. The subtypes of the 5D11 were IgG1/κ chains. Western blot analysis showed that mAb 5D11 could react with all 15 serotype reference strains of G. parasuis. None of the other bacteria tested reacted with 5D11. In addition, a linear B-cell epitope recognized by 5D11 was identified by serial truncations of HbpA protein and then a series of truncated peptides were synthesized to define the minimal region that was required for mAb 5D11 binding. The 5D11 epitope was located on amino acids 324-LPQYEFNLEKAKALLA-339 by testing the 5D11 monoclonal for reactivity with 14 truncations. The minimal epitope 325-PQYEFNLEKAKALLA-339 (designated EP-5D11) was pinpointed by testing the mAb 5D11 for reactivity with a series of synthetic peptides of this region. The epitope was highly conserved among G. parasuis strains, confirmed by alignment analysis. These results indicated that mAb 5D11 and EP-5D11 might potentially be used to develop serological diagnostic tools for G. parasuis. Three-dimensional structural analysis revealed that amino acids of EP-5D11 were in close proximity and may be exposed on the surface of the HbpA protein.
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Affiliation(s)
- Geyan Liu
- Research Center of Swine Disease, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China; (G.L.); (K.W.); (Z.Y.); (X.T.); (K.D.); (X.T.); (B.H.); (Y.Z.); (S.C.); (X.H.); (Q.Y.); (R.W.); (Q.Z.); (S.D.); (X.W.)
| | - Kang Wang
- Research Center of Swine Disease, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China; (G.L.); (K.W.); (Z.Y.); (X.T.); (K.D.); (X.T.); (B.H.); (Y.Z.); (S.C.); (X.H.); (Q.Y.); (R.W.); (Q.Z.); (S.D.); (X.W.)
| | - Zhen Yang
- Research Center of Swine Disease, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China; (G.L.); (K.W.); (Z.Y.); (X.T.); (K.D.); (X.T.); (B.H.); (Y.Z.); (S.C.); (X.H.); (Q.Y.); (R.W.); (Q.Z.); (S.D.); (X.W.)
| | - Xiaoyu Tang
- Research Center of Swine Disease, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China; (G.L.); (K.W.); (Z.Y.); (X.T.); (K.D.); (X.T.); (B.H.); (Y.Z.); (S.C.); (X.H.); (Q.Y.); (R.W.); (Q.Z.); (S.D.); (X.W.)
| | - Yung-Fu Chang
- Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, New York, NY 14850, USA;
| | - Ke Dai
- Research Center of Swine Disease, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China; (G.L.); (K.W.); (Z.Y.); (X.T.); (K.D.); (X.T.); (B.H.); (Y.Z.); (S.C.); (X.H.); (Q.Y.); (R.W.); (Q.Z.); (S.D.); (X.W.)
| | - Xinwei Tang
- Research Center of Swine Disease, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China; (G.L.); (K.W.); (Z.Y.); (X.T.); (K.D.); (X.T.); (B.H.); (Y.Z.); (S.C.); (X.H.); (Q.Y.); (R.W.); (Q.Z.); (S.D.); (X.W.)
| | - Bangdi Hu
- Research Center of Swine Disease, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China; (G.L.); (K.W.); (Z.Y.); (X.T.); (K.D.); (X.T.); (B.H.); (Y.Z.); (S.C.); (X.H.); (Q.Y.); (R.W.); (Q.Z.); (S.D.); (X.W.)
| | - Yiwen Zhang
- Research Center of Swine Disease, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China; (G.L.); (K.W.); (Z.Y.); (X.T.); (K.D.); (X.T.); (B.H.); (Y.Z.); (S.C.); (X.H.); (Q.Y.); (R.W.); (Q.Z.); (S.D.); (X.W.)
| | - Sanjie Cao
- Research Center of Swine Disease, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China; (G.L.); (K.W.); (Z.Y.); (X.T.); (K.D.); (X.T.); (B.H.); (Y.Z.); (S.C.); (X.H.); (Q.Y.); (R.W.); (Q.Z.); (S.D.); (X.W.)
| | - Xiaobo Huang
- Research Center of Swine Disease, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China; (G.L.); (K.W.); (Z.Y.); (X.T.); (K.D.); (X.T.); (B.H.); (Y.Z.); (S.C.); (X.H.); (Q.Y.); (R.W.); (Q.Z.); (S.D.); (X.W.)
| | - Qigui Yan
- Research Center of Swine Disease, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China; (G.L.); (K.W.); (Z.Y.); (X.T.); (K.D.); (X.T.); (B.H.); (Y.Z.); (S.C.); (X.H.); (Q.Y.); (R.W.); (Q.Z.); (S.D.); (X.W.)
| | - Rui Wu
- Research Center of Swine Disease, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China; (G.L.); (K.W.); (Z.Y.); (X.T.); (K.D.); (X.T.); (B.H.); (Y.Z.); (S.C.); (X.H.); (Q.Y.); (R.W.); (Q.Z.); (S.D.); (X.W.)
| | - Qin Zhao
- Research Center of Swine Disease, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China; (G.L.); (K.W.); (Z.Y.); (X.T.); (K.D.); (X.T.); (B.H.); (Y.Z.); (S.C.); (X.H.); (Q.Y.); (R.W.); (Q.Z.); (S.D.); (X.W.)
| | - Senyan Du
- Research Center of Swine Disease, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China; (G.L.); (K.W.); (Z.Y.); (X.T.); (K.D.); (X.T.); (B.H.); (Y.Z.); (S.C.); (X.H.); (Q.Y.); (R.W.); (Q.Z.); (S.D.); (X.W.)
| | - Xintian Wen
- Research Center of Swine Disease, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China; (G.L.); (K.W.); (Z.Y.); (X.T.); (K.D.); (X.T.); (B.H.); (Y.Z.); (S.C.); (X.H.); (Q.Y.); (R.W.); (Q.Z.); (S.D.); (X.W.)
| | - Yiping Wen
- Research Center of Swine Disease, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China; (G.L.); (K.W.); (Z.Y.); (X.T.); (K.D.); (X.T.); (B.H.); (Y.Z.); (S.C.); (X.H.); (Q.Y.); (R.W.); (Q.Z.); (S.D.); (X.W.)
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Petri FAM, Ferreira GC, Arruda LP, Malcher CS, Storino GY, Almeida HMDS, Sonalio K, Silva DGD, Oliveira LGD. Associations between Pleurisy and the Main Bacterial Pathogens of the Porcine Respiratory Diseases Complex (PRDC). Animals (Basel) 2023; 13:ani13091493. [PMID: 37174529 PMCID: PMC10177087 DOI: 10.3390/ani13091493] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 04/02/2023] [Accepted: 04/21/2023] [Indexed: 05/15/2023] Open
Abstract
Porcine Respiratory Diseases Complex (PRDC) is a multifactorial disease that involves several bacterial pathogens, including Mycoplasma hyopneumoniae (M. hyopneumoniae), Actinobacillus pleuropneumoniae (A. pleuropneumoniae), Pasteurella multocida (P. multocida), Glaesserella parasuis (G. parasuis), and Streptococcus suis (S. suis). In pigs, the infection may cause lesions such pleurisy, which can lead to carcass condemnation. Hence, 1015 carcasses were selected from three different commercial pig farms, where the respiratory conditions were evaluated using slaughterhouse pleurisy evaluation system (SPES) and classified into five groups. In total, 106 pleural and lung fragments were collected for qPCR testing to identify the five abovementioned pathogens. A moderate correlation between the severity of the lesions and the presence of P. multocida (R = 0.38) and A. pleuropneumoniae (R = 0.28) was observed. Concerning the lung samples, the severity of the lesions was moderately correlated with the presence of P. multocida (R = 0.43) and M. hyopneumoniae (R = 0.35). Moreover, there was a strong correlation between the presence of P. multocida and M.hyopneumoniae in the pleura (R = 0.82). Finally, this approach may be a useful tool to identify and quantify causative agents of PRDC using qPCR, providing a comprehensive evaluation of its relevance, strength, and potential application in the field as a surveillance tool for veterinarians.
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Affiliation(s)
| | - Geovana Coelho Ferreira
- School of Agricultural and Veterinarian Sciences, São Paulo State University (Unesp), Jaboticabal 14884-900, SP, Brazil
| | - Laíza Pinto Arruda
- School of Agricultural and Veterinarian Sciences, São Paulo State University (Unesp), Jaboticabal 14884-900, SP, Brazil
| | - Clarisse Sena Malcher
- School of Agricultural and Veterinarian Sciences, São Paulo State University (Unesp), Jaboticabal 14884-900, SP, Brazil
| | - Gabriel Yuri Storino
- School of Agricultural and Veterinarian Sciences, São Paulo State University (Unesp), Jaboticabal 14884-900, SP, Brazil
| | | | - Karina Sonalio
- School of Agricultural and Veterinarian Sciences, São Paulo State University (Unesp), Jaboticabal 14884-900, SP, Brazil
- Unit of Porcine Health Management, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium
| | - Daniela Gomes da Silva
- School of Agricultural and Veterinarian Sciences, São Paulo State University (Unesp), Jaboticabal 14884-900, SP, Brazil
| | - Luís Guilherme de Oliveira
- School of Agricultural and Veterinarian Sciences, São Paulo State University (Unesp), Jaboticabal 14884-900, SP, Brazil
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Qiao M, Zhang L, Chang J, Li H, Li J, Wang W, Yuan G, Su J. Rapid and sensitive detection of pathogenic Elizabethkingia miricola in black spotted frog by RPA-LFD and fluorescent probe-based RPA. FISH AND SHELLFISH IMMUNOLOGY REPORTS 2022; 3:100059. [PMID: 36419595 PMCID: PMC9680066 DOI: 10.1016/j.fsirep.2022.100059] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 06/21/2022] [Accepted: 06/22/2022] [Indexed: 12/03/2022] Open
Abstract
Established fluorescent probe-based RPA (exo RPA) and RPA-LFD methods for fast and sensitive detection of E. miricola. Exo RPA and RPA-LFD could detect E. miricola genomic DNA at 38 °C in 30 min. The detection sensitivity of exo RPA and RPA-LFD were 102 copies/μL. The exo RPA and RPA-LFD achieved rapid detection of E. miricola without bulky lab equipment.
Elizabethkingia miricola is a highly infectious pathogen, which causes high mortality rate in frog farming. Therefore, it is urgent to develop a rapid and sensitive detection method. In this study, two rapid and specific methods including recombinase polymerase amplification combined with lateral flow dipstick (RPA-LFD) and fluorescent probe-based recombinase polymerase amplification (exo RPA) were established to effectively detect E. miricola, which can accomplish the examination at 38 °C within 30 min. The limiting sensitivity of RPA-LFD and exo RPA (102 copies/μL) was ten-fold higher than that in generic PCR assay. The specificities of the two methods were verified by detecting multiple DNA samples (E. miricola, Staphylococcus aureus, Aeromonas hydrophila, Aeromonas veronii, CyHV-2 and Edwardsiella ictaluri), and the result showed that the single band was displayed in E. miricola DNA only. By tissue bacterial load and qRT-PCR assays, brain is the most sensitive tissue. Random 24 black spotted frog brain samples from farms were tested by generic PCR, basic RPA, RPA-LFD and exo RPA assays, and the results showed that RPA-LFD and exo RPA methods were able to detect E. miricola accurately and rapidly. In summary, the methods of RPA-LFD and exo RPA were able to detect E. miricola conveniently, rapidly, accurately and sensitively. This study provides prospective methods to detect E. miricola infection in frog culture.
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Affiliation(s)
- Meihua Qiao
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China
- Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, China
- Engineering Research Center of Green development for Conventional Aquatic Biological Industry in the Yangtze River Economic Belt, Ministry of Education, Wuhan 430070, China
| | - Liqiang Zhang
- Wuhan Academy of Agricultural Science, Wuhan 430070, China
| | - Jiao Chang
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China
| | - Haoxuan Li
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China
| | - Jingkang Li
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China
| | - Weicheng Wang
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China
| | - Gailing Yuan
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China
| | - Jianguo Su
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China
- Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, China
- Engineering Research Center of Green development for Conventional Aquatic Biological Industry in the Yangtze River Economic Belt, Ministry of Education, Wuhan 430070, China
- Corresponding author at: Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China.
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Characterization of a universal neutralizing monoclonal antibody against Glaesserella parasuis CdtB. Vet Microbiol 2022; 270:109446. [DOI: 10.1016/j.vetmic.2022.109446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 04/21/2022] [Accepted: 04/22/2022] [Indexed: 11/23/2022]
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Development and Application of Recombinase Polymerase Amplification Assays for Rapid Detection of Escherichia coli O157 in Food. FOOD ANAL METHOD 2022. [DOI: 10.1007/s12161-022-02250-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Cui Y, Guo F, Cai X, Cao X, Guo J, Wang H, Yang B, Zhou H, Su X, Blackall PJ, Xu F. Ct value-based real time PCR serotyping of Glaesserella parasuis. Vet Microbiol 2021; 254:109011. [PMID: 33610013 DOI: 10.1016/j.vetmic.2021.109011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Accepted: 02/03/2021] [Indexed: 11/24/2022]
Abstract
Glaesserella parasuis is the causative agent of Glässer's disease in swine. Serotyping plays an essential role in prevalence investigations and in the development of vaccination strategies for the prevention of this disease. Molecular serotyping based on variation within the capsule loci of the 15 serovars is more accurate and efficient than traditional serological serotyping. To reduce the running time and facilitate ease of data interpretation, we developed a simple and rapid cycle threshold (Ct) value-based real time PCR (qPCR) method for the identification and serotyping of G. parasuis. The qPCR method distinguished between all 15 serovar reference strains of G. parasuis with efficiency values ranging between 85.5 % and 110.4 % and, R2 values > 0.98. The qPCR serotyping was evaluated using 83 clinical isolates with 43 of the isolates having been previously assigned to a serovar by the gel immuno-diffusion (GID) assay and 40 non-typeable isolates. The qPCR results of 41/43 (95.3 %) isolates were concordant with the GID assay except two isolates of serovar 12 were assigned to serovar 5. In addition, the qPCR serotyping assigned a serovar to each of the 40 non-typeable isolates. Of the 83 isolates tested to assign a serovar, a concordance rate of 98.8 % (82/83) was determined between the qPCR and the previously reported multiplex PCR of Howell et al. (2015) (including those that were either serovars 5 or 12). Despite the inability to differentiate between serovars 5 and 12, the Ct value-based qPCR serotyping represents an attractive alternative to current molecular serotyping method for G. parasuis and could be used for both epidemiological monitoring and the guidance of vaccination programs.
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Affiliation(s)
- Yifang Cui
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, China
| | - Fangfang Guo
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, China
| | - Xuwang Cai
- State Key Laboratory of Agricultural Microbiology, Division of Animal Infectious Disease, Huazhong Agricultural University, Wuhan, Hubei, 430070, China
| | - Xiaoya Cao
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, China
| | - Jie Guo
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, China
| | - Hongjun Wang
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, China
| | - Bing Yang
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, China
| | - Hongzhuan Zhou
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, China
| | - Xia Su
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, China
| | - Patrick J Blackall
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St Lucia, Queensland, 4072, Australia
| | - Fuzhou Xu
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, China.
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Han Q, Wang J, Li R, Han Q, Yuan W, Wang J. Development of a recombinase polymerase amplification assay for rapid detection of Haemophilus parasuis in tissue samples. Vet Med Sci 2020; 6:894-900. [PMID: 32452632 PMCID: PMC7738723 DOI: 10.1002/vms3.287] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 04/26/2020] [Accepted: 05/04/2020] [Indexed: 12/31/2022] Open
Abstract
Haemophilus parasuis is the etiological agent of Glässer's disease in swine, which associates with severe economic losses in the swine industry worldwide. A real‐time recombinase polymerase amplification assay (real‐time RPA) was developed for direct and rapid detection of H. parasuis basing on the translation‐initiation factor IF2 (infB) gene. The assay was performed successfully at 39°C for 20 min in Genie III, which is portable and chargeable by battery. The developed assay was highly specific for H. parasuis, and the limit of detection of the assay was 6.0 × 103 fg of H. parasuis genomic DNA, which was the same as that of a real‐time PCR developed previously. The assay was further evaluated on 68 pig tissue samples, and 18 (26.5%), 20 (29.4%), and 8 (11.8%) samples were positive for H. parasuis by the real‐time RPA, real‐time PCR and bacterial isolation, respectively. With the bacteria isolation as the reference method, the real‐time RPA showed a diagnostic specificity of 83.33% and a diagnostic sensitivity of 100%. The above data demonstrated the well‐potentiality and usefulness of the developed real‐time RPA assay in reliable diagnosis of swine Glässer's disease, especially in resource limited settings.
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Affiliation(s)
- Qiaoyi Han
- College of Veterinary Medicine, Hebei Agricultural University, Baoding, China
| | - Jinfeng Wang
- Technology Center of Shijiazhuang Customs, Shijiazhuang, China.,Hebei Academy of Science and Technology for Inspection and Quarantine, Shijiazhuang, China
| | - Ruiwen Li
- College of Veterinary Medicine, Hebei Agricultural University, Baoding, China
| | - Qingan Han
- Hebei Animal Disease Prevention and Control Center, Shijiazhuang, China
| | - Wanzhe Yuan
- College of Veterinary Medicine, Hebei Agricultural University, Baoding, China
| | - Jianchang Wang
- Technology Center of Shijiazhuang Customs, Shijiazhuang, China.,Hebei Academy of Science and Technology for Inspection and Quarantine, Shijiazhuang, China
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