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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] [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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2
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Oliveira VHS, Dall Agnol AM, Fritzen JTT, Lorenzetti E, Alfieri AA, Alfieri AF. Microbial diversity involved in the etiology of a bovine respiratory disease outbreak in a dairy calf rearing unit. Comp Immunol Microbiol Infect Dis 2020; 71:101494. [PMID: 32434101 PMCID: PMC7212942 DOI: 10.1016/j.cimid.2020.101494] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Revised: 04/30/2020] [Accepted: 04/30/2020] [Indexed: 02/07/2023]
Abstract
BALF is a good biological sample for the molecular diagnosis of BRD in dairy calves. Mixed infections of viruses and bacteria were frequent in dairy calves with respiratory disease. BVDV 1d in BALF samples of dairy heifer calves in a BRD outbreak was characterized. The calf rearing unit without prophylactic measures for respiratory infections represent a risk factor for BRD.
The etiological agents involved in a bovine respiratory disease (BRD) outbreak were investigated in a dairy heifer calf rearing unit from southern Brazil. A battery of PCR assays was performed to detect the most common viruses and bacteria associated with BRD, such as bovine viral diarrhea virus (BVDV), bovine respiratory syncytial virus (BRSV), bovine alphaherpesvirus 1 (BoHV-1), bovine coronavirus (BCoV), bovine parainfluenza virus 3 (BPIV-3), Mannheimia haemolytica, Pasteurella multocida, Histophilus somni, and Mycoplasma bovis. Bronchoalveolar lavage fluid (BALF) samples were taken from 21 heifer calves (symptomatic n = 15; asymptomatic n = 6) that, during the occurrence of the BDR outbreak, were aged between 6 and 90 days. At least one microorganism was detected in 85.7 % (18/21) of the BALF samples. Mixed infections were more frequent (72.2 %) than single infections (27.7 %). The interactions between viruses and bacteria were the most common in coinfections (55.5 %). The frequencies of BRD agents were 38.1 % for BRSV, 28.6 % for BVDV, 33.3 % for BCoV, 42.85 % for P. multocida, 33.3 % for M. bovis, and 19 % for H. somni. BoHV-1, BPIV-3, and M. haemolytica were not identified in any of the 21 BALF samples. Considering that BALF and not nasal swabs were analyzed, these results demonstrate the etiological multiplicity that may be involved in BRD outbreaks in dairy calves.
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Affiliation(s)
- Victor H S Oliveira
- Laboratory of Animal Virology, Department of Veterinary Preventive Medicine, Universidade Estadual de Londrina, Brazil.,Section for Epidemiology, Norwegian Veterinary Institute, Norway
| | - Alais M Dall Agnol
- Laboratory of Animal Virology, Department of Veterinary Preventive Medicine, Universidade Estadual de Londrina, Brazil.,Multi-User Animal Health Laboratory, Molecular Biology Unit, Department of Veterinary Preventive Medicine, Universidade Estadual de Londrina, Brazil.,National Institute of Science and Technology for Dairy Production Chain, (INCT - LEITE), Universidade Estadual de Londrina, Brazil
| | - Juliana T T Fritzen
- Laboratory of Animal Virology, Department of Veterinary Preventive Medicine, Universidade Estadual de Londrina, Brazil.,Multi-User Animal Health Laboratory, Molecular Biology Unit, Department of Veterinary Preventive Medicine, Universidade Estadual de Londrina, Brazil
| | - Elis Lorenzetti
- Laboratory of Animal Virology, Department of Veterinary Preventive Medicine, Universidade Estadual de Londrina, Brazil.,Multi-User Animal Health Laboratory, Molecular Biology Unit, Department of Veterinary Preventive Medicine, Universidade Estadual de Londrina, Brazil.,Masters Degree in Animal Health and Production, Universidade Norte do Paraná, Arapongas, Paraná, Brazil
| | - Amauri A Alfieri
- Laboratory of Animal Virology, Department of Veterinary Preventive Medicine, Universidade Estadual de Londrina, Brazil.,Multi-User Animal Health Laboratory, Molecular Biology Unit, Department of Veterinary Preventive Medicine, Universidade Estadual de Londrina, Brazil.,National Institute of Science and Technology for Dairy Production Chain, (INCT - LEITE), Universidade Estadual de Londrina, Brazil
| | - Alice F Alfieri
- Laboratory of Animal Virology, Department of Veterinary Preventive Medicine, Universidade Estadual de Londrina, Brazil.,Multi-User Animal Health Laboratory, Molecular Biology Unit, Department of Veterinary Preventive Medicine, Universidade Estadual de Londrina, Brazil.,National Institute of Science and Technology for Dairy Production Chain, (INCT - LEITE), Universidade Estadual de Londrina, Brazil
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3
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Klein U, de Jong A, Youala M, El Garch F, Stevenin C, Moyaert H, Rose M, Catania S, Gyuranecz M, Pridmore A, Ayling RD. New antimicrobial susceptibility data from monitoring of Mycoplasma bovis isolated in Europe. Vet Microbiol 2019; 238:108432. [PMID: 31648729 DOI: 10.1016/j.vetmic.2019.108432] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Revised: 08/21/2019] [Accepted: 09/26/2019] [Indexed: 12/15/2022]
Abstract
Mycoplasma bovis is an important respiratory pathogen of cattle across Europe and is included in the MycoPath pan-European antimicrobial susceptibility monitoring programme. M. bovis strains (232) were isolated from cattle, not recently treated with antimicrobials, at diverse geographical locations in France, Great Britain, Hungary, Italy and Spain during 2014 to 2016. Only one isolate per farm and per outbreak was retained. For each isolate, the MICs of ten antimicrobials were determined in a central laboratory using a broth microdilution method with modified Eaton's medium and incubation at 35 °C ± 1 °C for 24 ± 6 h. MIC50/MIC90 (mg/L) values for the 232 strains were: danofloxacin 0.25/1; enrofloxacin 0.5/8; marbofloxacin 1/4; gamithromycin >64/>64; spiramycin 8/16; tilmicosin >64/>64; tulathromycin >64/>64; tylosin 64/>64; florfenicol 4/8; oxytetracycline 8/32. Minor between-country differences in the MIC90 values were observed for the fluoroquinolones, spiramycin and oxytetracycline, whilst the MIC values for the other compounds were similar. Spain and Italy had the higher MIC90 values for the fluoroquinolones. Compared with the 2010-2012 study (156 isolates) results are similar, with an overall MIC50 increase of at most one doubling dilution for enrofloxacin, spiramycin, tylosin, florfenicol and oxytetracycline. In contrast, the MIC90 value for oxytetracycline decreased from >64 to 32 mg/L. Standardized laboratory methods and interpretive criteria for MIC testing of veterinary mycoplasmas are clearly needed; there are currently no clinical breakpoints available to facilitate data interpretation and correlation of MICs with in vivo efficacy.
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Affiliation(s)
- Ulrich Klein
- MycoPath Study Group, c/o CEESA, 168 Av de Tervueren, 1150, Brussels, Belgium; Elanco Animal Health, Basingstoke, UK
| | - Anno de Jong
- MycoPath Study Group, c/o CEESA, 168 Av de Tervueren, 1150, Brussels, Belgium; Bayer Animal Health GmbH, Monheim, Germany.
| | - Myriam Youala
- MycoPath Study Group, c/o CEESA, 168 Av de Tervueren, 1150, Brussels, Belgium; Virbac, Carros, France
| | - Farid El Garch
- MycoPath Study Group, c/o CEESA, 168 Av de Tervueren, 1150, Brussels, Belgium; Vetoquinol S.A, Lure, France
| | - Clelia Stevenin
- MycoPath Study Group, c/o CEESA, 168 Av de Tervueren, 1150, Brussels, Belgium; Boehringer Ingelheim Vetmedica, Ingelheim, Germany
| | - Hilde Moyaert
- MycoPath Study Group, c/o CEESA, 168 Av de Tervueren, 1150, Brussels, Belgium; Zoetis, Zaventem, Belgium
| | - Markus Rose
- MycoPath Study Group, c/o CEESA, 168 Av de Tervueren, 1150, Brussels, Belgium; MSD Animal Health Innovation GmbH, Schwabenheim, Germany
| | - Salvatore Catania
- Mycoplasma Unit, Istituto Zooprofilattico Sperimentale delle Venezie, Verona, Italy
| | - Miklós Gyuranecz
- Institute for Veterinary Medical Research CAR-HAS, Budapest, Hungary
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Wisselink HJ, Smid B, Plater J, Ridley A, Andersson AM, Aspán A, Pohjanvirta T, Vähänikkilä N, Larsen H, Høgberg J, Colin A, Tardy F. A European interlaboratory trial to evaluate the performance of different PCR methods for Mycoplasma bovis diagnosis. BMC Vet Res 2019; 15:86. [PMID: 30866933 PMCID: PMC6417145 DOI: 10.1186/s12917-019-1819-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Accepted: 02/25/2019] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Several species-specific PCR assays, based on a variety of target genes are currently used in the diagnosis of Mycoplasma bovis infections in cattle herds with respiratory diseases and/or mastitis. With this diversity of methods, and the development of new methods and formats, regular performance comparisons are required to ascertain diagnostic quality. The present study compares PCR methods that are currently used in six national veterinary institutes across Europe. Three different sample panels were compiled and analysed to assess the analytical specificity, analytical sensitivity and comparability of the different PCR methods. The results were also compared, when appropriate, to those obtained through isolation by culture. The sensitivity and comparability panels were composed of samples from bronchoalveolar fluids of veal calves, artificially contaminated or naturally infected, and hence the comparison of the different methods included the whole workflow from DNA extraction to PCR analysis. RESULTS The participating laboratories used i) five different DNA extraction methods, ii) seven different real-time and/or end-point PCRs targeting four different genes and iii) six different real-time PCR platforms. Only one commercial kit was assessed; all other PCR assays were in-house tests adapted from published methods. The analytical specificity of the different PCR methods was comparable except for one laboratory where Mycoplasma agalactiae was tested positive. Frequently, weak-positive results with Ct values between 37 and 40 were obtained for non-target Mycoplasma strains. The limit of detection (LOD) varied from 10 to 103 CFU/ml to 103 and 106 CFU/ml for the real-time and end-point assays, respectively. Cultures were also shown to detect concentrations down to 102 CFU/ml. Although Ct values showed considerable variation with naturally infected samples, both between laboratories and tests, the final result interpretation of the samples (positive versus negative) was essentially the same between the different laboratories. CONCLUSION With a few exceptions, all methods used routinely in the participating laboratories showed comparable performance, which assures the quality of diagnosis, despite the multiplicity of the methods.
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Affiliation(s)
- Henk J Wisselink
- Wageningen Bioveterinary Research, P.O. Box 65, 8200 AB, Lelystad, The Netherlands.
| | - Bregtje Smid
- Wageningen Bioveterinary Research, P.O. Box 65, 8200 AB, Lelystad, The Netherlands
| | - Jane Plater
- Animal and Plant Health Agency (APHA), Surrey, UK
| | - Anne Ridley
- Animal and Plant Health Agency (APHA), Surrey, UK
| | | | - Anna Aspán
- National Veterinary Institute (SVA), Uppsala, Sweden
| | | | | | - Helene Larsen
- National Veterinary Institute, Technical University of Denmark, Lyngby, Denmark
| | - Jonas Høgberg
- National Veterinary Institute, Technical University of Denmark, Lyngby, Denmark
| | - Adélie Colin
- Anses, Lyon Laboratory, JRU Ruminants Mycoplasmoses, Anses, VetAgro Sup, University of Lyon, Lyon, France
| | - Florence Tardy
- Anses, Lyon Laboratory, JRU Ruminants Mycoplasmoses, Anses, VetAgro Sup, University of Lyon, Lyon, France
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Antimicrobial susceptibility monitoring of Mycoplasma hyopneumoniae and Mycoplasma bovis isolated in Europe. Vet Microbiol 2017; 204:188-193. [DOI: 10.1016/j.vetmic.2017.04.012] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2017] [Revised: 04/07/2017] [Accepted: 04/12/2017] [Indexed: 11/18/2022]
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Doyle D, Credille B, Lehenbauer TW, Berghaus R, Aly SS, Champagne J, Blanchard P, Crossley B, Berghaus L, Cochran S, Woolums A. Agreement Among 4 Sampling Methods to Identify Respiratory Pathogens in Dairy Calves with Acute Bovine Respiratory Disease. J Vet Intern Med 2017; 31:954-959. [PMID: 28295570 PMCID: PMC5434980 DOI: 10.1111/jvim.14683] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2016] [Revised: 01/27/2017] [Accepted: 01/31/2017] [Indexed: 11/26/2022] Open
Abstract
Background Four sampling techniques commonly are used for antemortem identification of pathogens from cattle with bovine respiratory disease (BRD): the nasal swab (NS), guarded nasopharyngeal swab (NPS), bronchoalveolar lavage (BAL), and transtracheal wash (TTW). Agreement among these methods has not been well characterized. Objective To evaluate agreement among TTW and NS, NPS, or BAL for identification of viral and bacterial pathogens in dairy calves with BRD. Animals One hundred dairy calves with naturally acquired BRD. Methods Calves were sampled by all 4 methods. Viral agents were identified by real‐time RT‐PCR, bacteria were identified by aerobic culture, and Mycoplasma bovis (M. bovis) isolates were speciated by PCR. Agreement among TTW and NS, NPS, or BAL was evaluated by calculating the kappa statistic and percent positive agreement. McNemar's exact test was used to compare the proportions of positive results. Results Agreement among TTW and NS, TTW and NPS, and TTW and BAL, was very good for identification of P. multocida, M. haemolytica, and M. bovis. For bovine respiratory syncytial virus (BRSV), agreement with TTW was moderate for NS, good for NPS, and very good for BAL. For bovine coronavirus (BCV), agreement with TTW was moderate for NS and NPS, and good for BAL. McNemar's test was significant only for BCV, indicating that for this pathogen the proportion of positive results from NS and NPS could not be considered comparable to TTW. Conclusions and Clinical Importance This study provides guidance for veterinarians selecting diagnostic tests for antemortem identification of pathogens associated with BRD.
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Affiliation(s)
- D Doyle
- Department of Population Health, College of Veterinary Medicine, University of Georgia, Athens, GA
| | - B Credille
- Department of Population Health, College of Veterinary Medicine, University of Georgia, Athens, GA
| | - T W Lehenbauer
- Veterinary Medicine Teaching and Research Center, School of Veterinary Medicine, University of California, Davis, Tulare, CA.,Department of Population Health and Reproduction, School of Veterinary Medicine, University of California, Davis, Tulare, CA
| | - R Berghaus
- Department of Population Health, College of Veterinary Medicine, University of Georgia, Athens, GA
| | - S S Aly
- Veterinary Medicine Teaching and Research Center, School of Veterinary Medicine, University of California, Davis, Tulare, CA.,Department of Population Health and Reproduction, School of Veterinary Medicine, University of California, Davis, Tulare, CA
| | - J Champagne
- Veterinary Medicine Teaching and Research Center, School of Veterinary Medicine, University of California, Davis, Tulare, CA
| | - P Blanchard
- California Animal Health & Food Safety Laboratory System, University of California, Davis, CA
| | - B Crossley
- California Animal Health & Food Safety Laboratory System, University of California, Davis, CA
| | - L Berghaus
- Department of Large Animal Medicine, College of Veterinary Medicine, University of Georgia, Athens, GA
| | - S Cochran
- Department of Population Health, College of Veterinary Medicine, University of Georgia, Athens, GA
| | - A Woolums
- Department of Large Animal Medicine, College of Veterinary Medicine, University of Georgia, Athens, GA
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Identification of novel immunogenic proteins from Mycoplasma bovis and establishment of an indirect ELISA based on recombinant E1 beta subunit of the pyruvate dehydrogenase complex. PLoS One 2014; 9:e88328. [PMID: 24520369 PMCID: PMC3919759 DOI: 10.1371/journal.pone.0088328] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Accepted: 01/07/2014] [Indexed: 11/23/2022] Open
Abstract
The pathogen Mycoplasma bovis (M. bovis) is a major cause of respiratory disease, mastitis, and arthritis in cattle. Screening the key immunogenic proteins and updating rapid diagnostic techniques are necessary to the prevention and control of M. bovis infection. In this study, 19 highly immunogenic proteins from M. bovis strain PD were identified using 2-dimensional gel electrophoresis, immunoblotting and MALDI-TOF/TOF MS. Of these 19 proteins, pyruvate dehydrogenase E1 component beta subunit (PDHB) showed excellent immune reactivity and repeatability. PDHB was found to be conserved in different M. bovis isolates, as indicated by Western blot analysis. On the basis of these results, a rPDHB-based indirect ELISA (iELISA) was established for the detection of serum antibodies using prokaryotically expressed recombinant PDHB protein as the coating antigen. The specificity analysis result showed that rPDHB-based iELISA did not react with other pathogens assessed in our study except M. agalactiae (which infects sheep and goats). Moreover, 358 serum samples from several disease-affected cattle feedlots were tested using this iELISA system and a commercial kit, which gave positive rates of 50.8% and 39.9%, respectively. The estimated Kappa agreement coefficient between the two methods was 0.783. Notably, 39 positive serum samples that had been missed by the commercial kit were all found to be positive by Western blot analysis. The detection rate of rPDHB-based iELISA was significantly higher than that of the commercial kit at a serum dilution ratio of 1∶5120 to 1∶10,240 (P<0.05). Taken together, these results provide important information regarding the novel immunogenic proteins of M. bovis. The established rPDHB-based iELISA may be suitable for use as a new method of antibody detection in M. bovis.
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Stipkovits L, Somogyi M, Asvanyi B, Toth A, Szathmary S. Short communication: Role of Mycoplasma arginini in mastitis caused by Streptococcus dysgalactiae. J Dairy Sci 2013; 96:1661-7. [DOI: 10.3168/jds.2012-5669] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2012] [Accepted: 11/26/2012] [Indexed: 11/19/2022]
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McDonald WL, Rawdon TG, Fitzmaurice J, Bolotovski I, Voges H, Humphrey S, Fernando K, Canagasebey Y, Thornton RN, McIntyre L. Survey of bulk tank milk in New Zealand for Mycoplasma bovis , using species-specific nested PCR and culture. N Z Vet J 2009; 57:44-9. [PMID: 19252542 DOI: 10.1080/00480169.2009.36867] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
AIM To survey the dairy cattle population in New Zealand for the presence or absence of Mycoplasma bovis. METHODS A random cross-sectional survey of bulk tank milk from dairy herds in New Zealand based on regionally proportioned sampling, weighted towards herds with a high bulk tank milk somatic cell count (SCC) was used to detect M. bovis at a between-herd prevalence of 2%, with 99% confidence. Bulk tank milk samples collected on-farm were tested using a nested M. bovis PCR, and bacteriological culture employing enrichment in mycoplasma broth and direct plating onto mycoplasma agar. RESULTS Mycoplasma bovis was not detected in any of the 244 bulk tank milk samples by either PCR or culture. CONCLUSIONS This survey provides further evidence that M. bovis is not present in the dairy cattle population in New Zealand.
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Affiliation(s)
- W L McDonald
- Investigation and Diagnostic Centre, Ministry of Agriculture and Forestry Biosecurity New Zealand, PO Box 40742, Upper Hutt 5140, New Zealand.
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Abstract
Mycoplasma bovis is an important and emerging cause of respiratory disease and arthritis in feedlot cattle and young dairy and veal calves, and has a variety of other disease manifestations in cattle. M. bovis is certainly capable of causing acute respiratory disease in cattle, yet the attributable fraction has been difficult to estimate. In contrast, M. bovis is more accepted as a cause of chronic bronchopneumonia with caseous and perhaps coagulative necrosis, characterized by persistent infection that seems poorly responsive to many antibiotics. An understanding of the disease has been recently advanced by comparisons of natural and experimentally induced disease, development of molecular diagnostic tools, and understanding some aspects of virulence, yet uncertainties regarding protective immunity, the importance of genotypic diversity, mechanisms of virulence, and the role of co-pathogens have restricted our understanding of pathogenesis and our ability to effectively control the disease. This review critically considers the relationship between M. bovis infection and the various manifestations of the bovine respiratory disease complex, and addresses the pathogenesis, clinical and pathologic sequelae, laboratory diagnosis and control of disease resulting from M. bovis infection in the bovine respiratory tract.
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