Table 6.
Percentage of antibiotic-resistant Enterococcus spp. in up-gradient (n = 4) versus down-gradient (n = 15) surface water samples and up-gradient (n = 5) versus down-gradient (n = 4) groundwater samples.
| Percent resistant
|
|||
|---|---|---|---|
| Sample type and antibiotic | Up-gradient samples | Down-gradient samples | p-Value |
| Surface water | |||
| Erythromycin | 0 | 18 | 0.02 |
| Tetracycline | 14 | 33 | 0.06 |
| Clindamycina | 100 | 89 | 0.76 |
| Virginiamycina | 0 | 23 | 0.17 |
| Vancomycin | 0 | 1 | 0.83 |
| Groundwater | |||
| Erythromycin | 67 | 20 | < 0.001 |
| Tetracycline | 3 | 19 | 0.07 |
| Clindamycina | 0 | 100 | < 0.001 |
| Virginiamycina | 0 | 0 | —b |
| Vancomycin | 10 | 0 | 0.15 |
p-Values were calculated using one-sided Fisher’s exact tests.
a
Analyses for clindamycin and virginiamycin resistance were restricted to non–E. faecalis isolates.
b
No p-value could be calculated due to zero counts of virginiamycin-resistant isolates in both sample types.