Table 3. Results of conjugation assays between antibiotic resistant E. coli isolates obtained from water samples and the recipient E. coli MC-1061 strain.
| Strain no. | Parent strain | Transconjugant | Transfer frequency | ||
| Resistance patterna | Plasmid pattern (MDa) | Resistance patterna | Plasmid pattern (MDa) | ||
| 25C3 | Amp-Sxt | 140,62,45,2.3,2.0 | Amp-Sxt | 62 | 9×10−4 |
| 51C1 | Amp-Cip-NA-Sxt-Mel | 90,62,4.8,3.7 | Amp | 62 | 5.2×10−4 |
| 88mf2 | Amp-Cro-Mel | 105, 70 | Amp-Cro | 70 | 4.8×10−4 |
| 133C4 | Amp-Sxt-Te | 50 | Amp-Sxt-Te | 50 | 1.95×10−2 |
| 174TC1 | Amp-Cip-Cro-Sxt-NA-Te-C-Cn | 105,2.7,2.1,1.4,1.2 | Amp-Cro | 105 | 4.4×10−4 |
a
See footnote a of Table 2 for definitions of abbreviations.