Table 2. Application of different methods of duplicate isolate removal based on hypothetical data in Table 1*.
| Method | No. isolates | No. susceptible (%)† |
|---|---|---|
| No removal | 21 | 9 (43) |
| Cerner, 3 d | 19 | 8 (42) |
| NCCLS, 3 d | 18 | 7 (39) |
| Cerner, 10 d | 15 | 6 (40) |
| NCCLS, 10 d | 12 | 4 (33) |
| Cerner, 30 d | 12 | 5 (42) |
| NCCLS, 30 d | 9 | 3 (33) |
| Cerner, 90 d | 10 | 4 (40) |
| NCCLS, 90 d | 6 | 2 (33) |
| Cerner, 365 d | 7 | 3 (43) |
| NCCLS, 365 d | 3 | 1 (33) |
| Most resistant | 3 | 0 |
| Most susceptible | 3 | 2 (67) |
*d, days; NCCLS, National Committee for Clinical Laboratory Standards. †Susceptibility percentage is calculated as the proportion of the number of susceptible isolates divided by the number of total isolates tested and eligible for inclusion according to the analysis method used.