A cohort study of coagulase negative staphylococcal ...
|Title||A cohort study of coagulase negative staphylococcal mastitis in selected dairy herds in Prince Edward Island|
|Author(s)||T. Jeffery Davidson, Ian R. Dohoo, A. W. Donald, H. Hariharan, K. Collins|
|Journal||Canadian Journal of Veterinary Research = Revue Canadienne de Recherche Veterinaire|
|Abstract||The epidemiology and importance of coagulase negative staphylococcal (CNS) mastitis in Prince Edward Island had not been documented. To investigate this, a cohort of 84 cows at seven farms were quarter sampled eight times over a lactation, commencing with samples taken prior to drying off in the previous lactation. Thirteen species of CNS were isolated. The quarter prevalence of CNS mastitis varied from 4.8% to 6.4% in the first five months of lactation and increased to 14.2 to 16.6% in the last four months of lactation. The geometric mean somatic cell counts (SCC) for quarters infected with CNS and uninfected quarters were 90 x 10(3) and 64 x 10(3) respectively (difference significant at p > 0.005). The two month new infection risk of CNS was 9.0% while the two month elimination risk was 74.4%. Infection with CNS did not alter the risk of subsequent infection with Staphylococcus aureus. The results from this project support the classification of CNS as a minor pathogen in mastitis control programs.|
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