Table 2.
Decay half-lives for MRSA and Staphylococcus aureus in a model including (Model 1) and excluding (Model 2) data from Farm D.
| MRSA Model 1 | MRSA Model 2 | S. aureus Model 1 | S. aureus Model 2 | |
|---|---|---|---|---|
| Farms | A, B, C, D, E | A, B, C, E | A, B, C, D, E, F | A, B, C, E, F |
| Measurements (n) | 92 | 71 | 140 | 118 |
| Correlation, r2 | 0.88 | 0.83 | 0.86 | 0.86 |
| Decay constant (λ) | −0.140 | −0.172 | −0.127 | −0.156 |
| SE (λ) | 0.014 | 0.017 | 0.016 | 0.020 |
| Bacterial concentration in CFU m−2 at t0 (N0) | 7.4 × 104 | 1.2 × 105 | 4.3 × 105 | 5.6 × 105 |
| Half-life (t½) in days | 5.0 (4.1–6.2) | 4.0 (3.4–5.0) | 5.5 (4.5–7.2) | 4.4 (3.6–5.9) |
| 90% die-off in days | 33 (28–41) | 28 (22–33) | 36 (29–48) | 30 (24–39) |
| 99% die-off in days | 49 (41–61) | 40 (34–50) | 54 (44–72) | 44 (35–59) |
| 99.9 % die-off in days | 66 (55–82) | 54 (45–66) | 72 (58–96) | 59 (47–79) |
CFU, colony-forming units. N0 represents the CFU number of bacteria at the first measure of the survival study (t0).