Year | No of isolates | Minimal inhibitory concentration (ug/ml) | Susceptibility to erythromycin (n) % | Resistance determinants (n) % | |||||
MIC50 | MIC90 | Sa (%) | Ia (%) | Ra (%) | erm (B) | mef (A) | erm (B) + mef (A) | ||
2005 | 39 | 6 | >256 | 20 (51.3) | 1(2.6) | 18 (46.2) | 5 (27.8) | 9 (50.0) | 4 (22.2) |
2006 | 41 | 16 | >256 | 18 (43.9) | 2 (4.9) | 21 (51.2) | 9 (42.9) | 11 (52.4) | 1 (4.8) |
2007 | 36 | 48 | >256 | 14 (38.9) | 0 (0.0) | 22 (61.1) | 8 (36.4) | 10 (45.4) | 4 (18.2) |
2008 | 42 | 16 | >256 | 18 (42.9) | 2 (4.8) | 22 (52.4) | 4 (18.2) | 15 (68.2) | 3 (13.6) |
2009 | 52 | 126 | >256 | 15 (28.8) | 2 (3.8) | 35 (67.3) | 3 (8.6%) | 18 (51.4) | 8 (22.9) |
2010 | 45 | >256 | >256 | 15 (33.3) | 2 (4.4) | 28 (62.2) | 8 (28.6) | 11 (39.3) | 9 (32.1) |
Total | 255 | 16 | >256 | 100 (39.2) | 9 (3.5) | 146 (57.3) | 37 (25.3) | 74 (50.7) | 29 (19.9) |