Table 1.
Susceptibility against seven antimicrobials of the 99 serotype 23F strains isolated in Beijing, n (%)
| Antibiotic | 1997–1998 (n = 25) | 1999–2000 (n = 10) | 2001–2002 (n = 21) | 2003–2004 (n = 16) | 2005–2006 (n = 14) | 2010 (n = 13) | Total (n = 99) |
|---|---|---|---|---|---|---|---|
| Penicillin | |||||||
| Int | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Res | 1 (4·0) | 0 | 0 | 0 | 0 | 0 | 1 (1·0) |
| Cefuroxime | |||||||
| Int | 1 (4·0) | 0 | 2 (9·5) | 1 (6·3) | 2 (14·3) | 9 (69·3) | 15 (15·2) |
| Res | 0 | 0 | 1 (4·7) | 3 (18·8) | 2 (14·3) | 3 (23·1) | 9 (9·1) |
| Ceftriaxone | |||||||
| Int | 1 (4·0) | 0 | 0 | 1 (6·3) | 2 (14·3) | 1 (7·7) | 5 (5·1) |
| Res | 1 (4·0) | 0 | 0 | 0 | 0 | 0 | 1 (1·0) |
| Erythromycin | |||||||
| Int | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Res | 24 (96·0) | 9 (90) | 21 (100) | 16 (100) | 14 (100) | 13 (100) | 97 (98·0) |
| Tetracycline | |||||||
| Int | 0 | 0 | 2 (9·5) | 0 | 1 (7·1) | 3 (23·1) | 6 (6·1) |
| Res | 21 (84·0) | 10 (100) | 18 (85·7) | 16 (100) | 13 (92·9) | 10 (76·9) | 88 (88·9) |
| Sulfamethoxazole–trimethoprim | |||||||
| Int | 1 (4·0) | 0 | 1 (4·7) | 2 (12·5) | 1 (7·1) | 1 (7·7) | 6 (6·1) |
| Res | 21 (84·0) | 10 (100) | 20 (95·3) | 14 (87·5) | 12 (85·8) | 12 (92·3) | 89 (89·9) |
| Chloramphenicol | |||||||
| Int | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Res | 4 (16·0) | 2 (20·0) | 4 (19·0) | 5 (31·3) | 2 (14·3) | 0 | 17 (17·2) |
Int, Intermediate; Res, resistant.