Table 2. Distribution of coagulase-negative Staphylococcus (CNS) species isolated from milk samples from cattle on 5 US dairies.
The milk samples were taken at dry-off, calving, 7 days post-calving and during mastitis events occurring within 100 days in milk (DIM). All isolates were identified by bacterial culture, coagulase and catalase testing, and confirmed by rpoB partial gene sequencing.
| Organism | Dairy ID (State abbreviation and dairy number) | ||||||
|---|---|---|---|---|---|---|---|
| CA1 | CA2 | IA | MN | WI1 | Total | Percent total | |
| S. chromogenes | 78 | 92 | 44 | 34 | 42 | 290 | 48.3 |
| S. haemolyticus | 8 | 5 | 20 | 24 | 51 | 108 | 18.0 |
| S. simulans | – | – | 12 | 21 | 6 | 39 | 6.5 |
| S. epidermidis | 5 | 12 | 5 | 12 | 5 | 39 | 6.5 |
| S. hominis | – | 1 | 11 | 2 | 14 | 28 | 4.7 |
| S. auricularis | – | 1 | 6 | 15 | 3 | 25 | 4.2 |
| S. sciuri | 2 | 4 | 4 | 1 | 2 | 13 | 2.2 |
| S. capitis | – | 5 | 1 | 5 | – | 11 | 1.8 |
| S. cohnii | – | 1 | 3 | 3 | 2 | 9 | 1.5 |
| S. warneri | 2 | – | – | 4 | – | 6 | 1.0 |
| S. pasteuri | – | 2 | 1 | 2 | – | 5 | 0.8 |
| S. xylosus | – | – | 1 | 3 | – | 4 | 0.7 |
| S. hyicus | 1 | 2 | – | – | – | 3 | 0.5 |
| S. equorum | 1 | – | 1 | – | – | 2 | 0.3 |
| S. microti | 2 | – | – | – | – | 2 | 0.3 |
| S. rostri | 1 | – | – | 1 | – | 2 | 0.3 |
| S. gallinarum | 1 | – | – | – | – | 1 | 0.2 |
| S. saprophyticus | – | – | – | 1 | – | 1 | 0.2 |
| S. succinus | – | – | – | 1 | – | 1 | 0.2 |
| S. spp KS-SP | – | – | 3 | 7 | 2 | 12 | 2.0 |
| Total | 101 | 125 | 112 | 136 | 127 | 601 | 100.0 |