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)