Table 3.
Resistant intestinal enterococci isolates (/total isolates) by the disc diffusion method on PDM agar and percentage resistant enterococci as determined by the ratio CFU ml−1 on ES agar with and without antimicrobials (%) in concentrations corresponding to Table 1
| Ciprofloxacin | Imipenem | Ampicillin | Vancomycin | |||||
|---|---|---|---|---|---|---|---|---|
| Antimicrobial Medium | PDM | ES | PDM | ES | PDM | ES | PDM | ES |
| Sampling date | ||||||||
| 13 December 2000 | 2/12 | 0.2 | 2/12 | 0.2 | 2/12 | 0.1 | 2/12 | <0.1 |
| 15 February 2001 | 0/24 | 3.5a | 0/24 | <0.1 | 0/24 | <0.1 | 0/24 | <0.1 |
| 17 April 2001 | 2/24 | 4.0a | 0/24 | 1.0 | 1/24 | <0.1 | 0/24 | <0.1 |
| 07 June 2001 | 0/20 | ND | 0/20 | ND | 0/20 | ND | 0/20 | ND |
| 30 August 2001 | 9/24a | ND | 0/24 | ND | 0/20 | ND | 0/20 | ND |
| 24 October 2001 | 8/30a | 0.4 | 0/30 | 0.3 | 0/30 | <0.1 | 0/30 | <0.1 |
| 24 January 2002 | 0/24 | <0.1 | 0/24 | <0.1 | 0/24 | <0.1 | 0/24 | <0.1 |
|
| ||||||||
| 21/158 | 2/158 | 3/158 | 0/158 | |||||
a(P<0.05).