TABLE 5.
Cumulative percentages of 10 bacteria species and culture-negative samples isolated from composite cow milk samples distributed on various cell count thresholds.
| SCC × 103 cells/mL | % CNS | % STA | % STH | % STI | % SAG | % SUB | % SDY | % SFA | % SCA | % SPY | % No growth |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 50 | 15.3 | 7.3 | 3.5 | 17.4 | 3.1 | 6.7 | 2.4 | 6.8 | 12.0 | 6.3 | 39.5 |
| 100 | 29.6 | 14.3 | 7.4 | 32.3 | 6.6 | 12.4 | 5.9 | 12.7 | 17.0 | 12.6 | 56.9 |
| 150 | 40.6 | 19.9 | 10.9 | 44.3 | 10.9 | 18.3 | 9.5 | 18.4 | 26.4 | 18.9 | 66.8 |
| 200 | 49.1 | 24.7 | 14.0 | 53.0 | 14.1 | 23.3 | 13.1 | 23.7 | 35.2 | 23.6 | 73.3 |
| 250 | 55.9 | 28.8 | 16.7 | 58.9 | 17.2 | 28.3 | 16.4 | 28.3 | 37.1 | 26.8 | 77.5 |
| 300 | 61.4 | 32.3 | 18.8 | 64.4 | 20.2 | 32.5 | 19.1 | 33.2 | 39.6 | 33.1 | 80.6 |
| 350 | 65.7 | 35.3 | 21.1 | 68.3 | 23.5 | 36.3 | 22.1 | 37.9 | 43.4 | 40.2 | 82.9 |
| 400 | 69.3 | 37.8 | 23.0 | 71.8 | 26.1 | 39.9 | 25.2 | 41.8 | 48.4 | 42.5 | 84.7 |
| 450 | 72.2 | 40.1 | 25.1 | 74.4 | 28.2 | 43.3 | 27.9 | 45.1 | 49.7 | 44.9 | 86.3 |
| 500 | 74.8 | 42.2 | 26.9 | 76.2 | 30.3 | 46.0 | 31.3 | 48.4 | 52.2 | 48.0 | 87.6 |
| 750 | 82.7 | 50.5 | 33.5 | 82.3 | 39.0 | 57.3 | 42.9 | 60.4 | 61.6 | 62.2 | 91.4 |
| Sample size | 111 461 | 9550 | 3972 | 1458 | 4759 | 9173 | 3159 | 2603 | 159 | 127 | 195 644 |
Source: Milk laboratory, Faculty of Veterinary Science, University of Pretoria
SCC, somatic cell counts; CNS, coagulase-negative staphylococci; STA and STH, Staphylococcus aureus; STI, Staphylococcus pseudintermedius; SAG, Streptococcus agalactiae; SUB, Streptococcus uberis; SDY, Streptococcus dysgalactiae; SFA, Enterococcus faecalis; SCA, Enterococcus canis; SPY, Streptococcus pyogenes; no growth, culture-negative samples.
n = 345 461.