Table 2.
Resistant coliform bacterial isolates (/total isolates) by the disc diffusion method on PDM agar and percentage resistant coliform bacteria as determined by the ratio CFU ml−1 on LES endoagar with and without antimicrobials (%) in concentrations corresponding to Table 1
| Ciprofloxacin | Imipenem | Trimetroprim–Sulphamethoxazole | ||||
|---|---|---|---|---|---|---|
| Antimicrobial Medium | PDM | LES | PDM | LES | PDM | LES |
| Sampling date | ||||||
| 13 December 2000 | 0/44 | 1.4 | 0/44 | <0.1 | 0/44 | 0.7 |
| 15 February 2001 | 2/43 | <0.1 | 1/43 | <0.1 | 0/43 | 0.2 |
| 17 April 2001 | 0/58 | 1.1 | 3/58 | <0.1 | 0/58 | 3.4 |
| 07 June 2001 | 0/16 | ND | 0/16 | ND | 0/16 | ND |
| 30 August 2001 | 0/46 | ND | 0/46 | ND | 0/46 | ND |
| 24 October 2001 | 0/34 | <0.1 | 1/29 | <0.1 | 1/29 | 5.4 |
| 24 January 2002 | 1/37 | <0.1 | 1/37 | 0.1 | 5/37 | 3.8 |
| 3/273 | 6/273 | 6/273 | ||||