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
Date 1992
Volume 56
Issue 4
Start page 275
End page 280
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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