TABLE 2.
Percentages of antibiotic-resistant E. coli isolates from WWTPs, surface waters, and oystersa
| Source of isolates (no. of isolates) | % of isolates from indicated source resistant to:
|
||||||
|---|---|---|---|---|---|---|---|
| ≥1 antibiotic | Ampicillin | Cephalothin | Nalidixic acid | Sulfafurazole | Gentamicin | Tetracycline | |
| WWTPs (100) | 31 A | 15 A | 14 A | 5 A | 17 A | NR A | 10 A |
| PS (74) | 87 B | 19 A | 41 B | 5 A | 32 B | 8 B | 51 B |
| NPS (88) | 62 C | 7 B | 30 C | NR B | 20 A | NR A | 34 C |
| Oysters (50) | 4 D | NR C | 2 D | NR B | NR C | 4 C | NR D |
a
Letters indicate significant differences (P < 0.05) between sources. NR, no resistance.