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Table 2 Correlation between the main serotypes of azithromycin-resistant Streptococcus pneumoniae isolates and macrolide-resistant genes

From: Increase in the rate of azithromycin-resistant Streptococcus pneumoniae isolates carrying the erm(B) and mef(A) genes in Taiwan, 2006–2010

Serotype*

No. of isolates

No. (%) of isolates, by resistant gene

erm(B) -positive

mef(A) -positive

mef(A)/erm(B) -positive

19F

112

14 (13)

40 (36)

58 (52)

23 F

90

66 (73)

21 (23)

3 (3)

14

71

62 (87)

8 (11)

1 (1)

6B

66

35 (53)

29 (44)

2 (3)

19A

36

10 (28)

4 (11)

22 (61)

3

23

23 (100)

0 (0)

0 (0)

15B

15

15 (100)

0 (0)

0 (0)

23A

16

14 (88)

1 (6)

1 (6)

NT

28

25 (89)

3 (11)

0 (0)

Others**

29

25 (86)

0 (0)

4 (14)

  1. NT: nontypeable.
  2. *Data of serotype were used in this study as reported by Tsai HY et al. [14],
  3. **Include 9 V (n = 9), 6A (n = 9), 10A (n = 2), 20 (n = 1), 11A (n = 1), 15A (n = 5), 22 F (n = 2).