Table 1.
Distribution of mastitis pathogens from 41 herds in Canada
| Pathogen | No. of cases | % of samples | % of isolates |
|---|---|---|---|
| Escherichia coli | 35 | 17.7 | 29.9 |
| Staphylococcus aureus | 26 | 13.1 | 22.2 |
| Streptococcus spp. | 19 | 9.6 | 16.2 |
| Coagulase-negative staphylococcus | 9 | 4.5 | 7.7 |
| Streptococcus uberis | 8 | 4.0 | 6.8 |
| Other Gram negative | 4 | 2.0 | 3.4 |
| Klebsiella spp. | 4 | 2.0 | 3.4 |
| Streptococcus dysgalactiae | 3 | 1.5 | 2.6 |
| Arcanobacterium pyogenes | 3 | 1.5 | 2.6 |
| Yeasts | 2 | 1.0 | 1.7 |
| Bacillus spp. | 2 | 1.0 | 1.7 |
| Prototheca spp. | 1 | 0.5 | 0.9 |
| Enterobacter spp | 1 | 0.5 | 0.9 |
| Culture negative | 39 | 19.7 | |
| Contaminated | 42 | 21.2 |