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Abstract

The objective of the present study was to look for genes encoding for superantigens in bovine coagulase-negative staphylococci (CNS) isolated from milk in Canada. We screened by PCR 71 bovine CNS isolates, obtained from the Mastitis Pathogen Culture Collection managed by the Canadian Bovine...

Author(s)
Corbeil, A.; Labrie, J.; Goetz, C.; Dufour, S.; Doghri, I.; Rivière, L.; Jacques, M.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2019, 102, 3, pp 2008-2010
Abstract

Mastitis is the most prevalent and costly disease in dairy cattle worldwide, with implications for animal health and welfare as well as production and economics. Nonlactating heifers are an often-neglected group of animals concerning mastitis management, as they are assumed to be free of mastitis....

Author(s)
Naqvi, S. A.; Buck, J. de; Dufour, S.; Barkema, H. W.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2018, 101, 4, pp 3233-3247
Abstract

Emergence and spread of antimicrobial resistance is a major concern for the dairy industry worldwide. Objectives were to determine: (1) phenotypic and genotypic prevalence of drug-specific resistance for 25 species of non-aureus staphylococci, and (2) associations between presence of resistance...

Author(s)
Nobrega, D. B.; Naushad, S.; Naqvi, S. A.; Condas, L. A. Z.; Saini, V.; Kastelic, J. P.; Luby, C.; Buck, J. de; Barkema, H. W.
Publisher
Frontiers Media S.A., Lausanne, Switzerland
Citation
Frontiers in Microbiology, 2018, 9, February, pp 256
Abstract

Staphylococcus epidermidis has been suggested as a main reservoir of methicillin resistance and virulence genes facilitating the evolution of Staphylococcus aureus as a successful pathogen. However, it remains a mystery where and how S. epidermidis obtains these numerous genes to serve as the...

Author(s)
Xue HuPing; Wu ZhaoWei; Qiao DanDan; Tong Chao; Zhao Xin
Publisher
Elsevier B. V., Amsterdam, Netherlands
Citation
International Journal of Antimicrobial Agents, 2017, 50, 4, pp 581-587
Abstract

The objective of this study was to estimate Canadian national milk quality parameters and estimate the bulk tank milk (BTM) prevalence of 4 mastitis pathogens, Staphylococcus aureus, Streptococcus agalactiae, Mycoplasma bovis, and Prototheca spp., on Canadian dairy farms. A questionnaire was sent...

Author(s)
Bauman, C. A.; Barkema, H. W.; Dubuc, J.; Keefe, G. P.; Kelton, D. F.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2018, 101, 3, pp 2679-2691
Abstract

Non-aureus staphylococci (NAS), the microorganisms most frequently isolated from bovine milk worldwide, are a heterogeneous group of numerous species. To establish their importance as a group, the distribution of individual species needs to be determined. In the present study, NAS intramammary...

Author(s)
Condas, L. A. Z.; Buck, J. de; Nobrega, D. B.; Carson, D. A.; Naushad, S.; Vliegher, S. de; Zadoks, R. N.; Middleton, J. R.; Dufour, S.; Kastelic, J. P.; Barkema, H. W.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2017, 100, 7, pp 5592-5612
Abstract

The effect of non-aureus staphylococci (NAS) in bovine mammary health is controversial. Overall, NAS intramammary infections (IMI) increase somatic cell count (SCC), with an effect categorized as mild, mostly causing subclinical or mild to moderate clinical mastitis. However, based on recent...

Author(s)
Condas, L. A. Z.; Buck, J. de; Nobrega, D. B.; Carson, D. A.; Roy, J. P.; Keefe, G. P.; DeVries, T. J.; Middleton, J. R.; Dufour, S.; Barkema, H. W.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2017, 100, 7, pp 5613-5627
Abstract

This study was conducted to evaluate the association between subclinical intramammary infection (IMI) with coagulase-negative staphylococci (CNS), mammary quarter milk somatic cell count (SCC), and persistence of IMI in dairy cattle. Convenience samples of CNS isolates harvested from milk samples...

Author(s)
Fry, P. R.; Middleton, J. R.; Dufour, S.; Perry, J.; Scholl, D.; Dohoo, I.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2014, 97, 8, pp 4876-4885
Abstract

Mastitis is a common and costly production disease on dairy farms. In Canada, the incidence rate of clinical mastitis (IRCM) has been determined for conventionally managed dairy farms; however, no studies to date have assessed rates in organically managed systems. The objectives of this...

Author(s)
Levison, L. J.; Miller-Cushon, E. K.; Tucker, A. L.; Bergeron, R.; Leslie, K. E.; Barkema, H. W.; DeVries, T. J.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2016, 99, 2, pp 1341-1350
Abstract

Approximately 8,000 isolates of Streptococcus agalactiae, Streptococcus dysgalactiae, Streptococcus uberis, Staphylococcus aureus, and Escherichia coli, isolated by 25 veterinary laboratories across North America between 2002 and 2010, were tested for in vitro susceptibility to beta-lactam,...

Author(s)
Lindeman, C. J.; Portis, E.; Johansen, L.; Mullins, L. M.; Stoltman, G. A.
Publisher
American Association of Veterinary Laboratory Diagnosticians, Davis, USA
Citation
Journal of Veterinary Diagnostic Investigation, 2013, 25, 5, pp 581-591

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