Table 4.
Comparison of S. aureus cell density following 12 h incubation in a mono-culture vs. dual species culture.
| Broth/starting mixturea | # of cups tested | Cell density (cfu/ml) mean (SE)c | Log10 cell density | Log10 cell density 95% confidence interval | P-valueb |
|---|---|---|---|---|---|
| Inoculum (T = 0 h) | |||||
| Dual Species culture | 5 | 3.2 × 104 (2.7 × 103) | 4.50 | (4.29, 4.72) | 0.3683 |
| Monoculture | 8 | 2.9 × 104 (6.0 × 103) | 4.39 | (4.22, 4.56) | |
| Media control (T = 12 h) | |||||
| Dual Species culture | 5 | 6.9 × 106 (1.1 × 106) | 6.81 | (6.65, 6.97) | <.0001 |
| Monoculture | 3 | 1.1 × 108 (2.7 × 106) | 8.02 | (7.82, 8.23) | |
| Broth (T = 12 h) | |||||
| Dual Species culture | 16 | 1.0 × 107 (1.9 × 106) | 6.91 | (6.76, 7.05) | <.0001 |
| Monoculture | 5 | 1.4 × 108 (7.8 × 106) | 8.14 | (7.88, 8.39) | |
| Sonicated cup (T = 12 h) | |||||
| Dual species culture | 11 | 1.4 × 102 (1.8 × 101) | 2.10 | (1.95, 2.25) | <.0001 |
| Monoculture | 4 | 1.0 × 104 (2.9 × 103) | 3.95 | (3.70, 4.20) | |
a
Dual Species culture contained both S.aureus + L.gasseri; monoculture contained S.aureus alone.
b
Count data were log transformed prior to testing. An ANOVA model with fixed inoculum effect was used for analysis.
c
Mean(cfu/ml) uses original scale.