| prevalence study of staphylococcus aureus in quarter milk samples of dairy cows in the canton of bern, switzerland. | in the present study, the prevalence of s. aureus in mammary gland quarters of dairy cows in switzerland was estimated and a risk factor analysis was carried out. dairy cows were selected by one-step-cluster sampling with stratification by herd size. forty-seven of 50 randomly chosen farms participated in the study, resulting in 603 cows and 2388 quarter samples. milk samples were collected in all herds on two occasions two weeks apart. in 6% of cows (95% ci: 2.7-9.3%) at least one milk sample w ... | 2009 | 18692924 |