Table 5.
Distribution of bacteriological diagnoses from quarter milk samples from cows newly or chronically infected with subclinical mastitis.
| Diagnosis | Newly infected cows (n, %) | Chronically infected cows (n, %) | Total |
|---|---|---|---|
| Staphylococcus aureus | 44 (15%) | 66 (22%) | 110 (18.6%) |
| Coagulase-negative staphylococci | 51 (18%) | 46 (15%) | 97 (16.4%) |
| Streptococcus dysgalactiae | 21 (7.3%) | 33 (11%) | 54 (9.2%) |
| Streptococcus uberis | 18 (6.4%) | 31 (10%) | 49 (8.3%) |
| Streptococcus agalactiae | 0 | 1 (0.3%) | 1 (0.2%) |
| Other streptococci | 4 (1.4%) | 7 (2.3%) | 11 (1.9%) |
| Enterococci | 1 (0.3%) | 4 (1.3%) | 5 (0.8%) |
| Arcanobacterium pyogenes | 1 (0.3%) | 1 (0.3%) | 2 (0.3%) |
| Escherichia coli | 7 (2.5%) | 10 (3.3%) | 17 (2.9%) |
| Klebsiella spp. | 3 (1.1%) | 2 (0.7%) | 5 (0.8%) |
| Other coliform bacteria | 2 (0.7%) | 1 (0.3%) | 3 (0.5%) |
| Other bacteria | 2 (0.7%) | 1 (0.3%) | 3 (0.5%) |
| Contaminated | 60 (21%) | 45 (15%) | 105 (17.8%) |
| No growth | 72 (25%) | 56 (19%) | 128 (21.7%) |
| Total | 286 | 304 | 590 |