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Table 2 Frequency and combinations of ESBL genes among phenotypically identified ESBL- producing Enterobacteriaceae

From: Prevalence and molecular characteristics of ESBL and AmpC β -lactamase producing Enterobacteriaceae strains isolated from UTIs in Egypt

Genes

E. coli (n = 211)

K. pneumoniae (n = 53)

Citrobacter spp. (n = 40)

Proteus spp. (n = 7)

Total (n = 311)

blaCTX-M group

CTX-M-15 alone

38 (18%)

0 (0%)

0 (0%)

0 (0%)

38 (12.2%)

CTX-M-1 alone

31(14.7%)

6 (11.3%)

3 (7.5%)

1 (14.3%)

41 (13.2%)

CTX-M-1 + 15

32 (15.2%)

35 (66%)

30 (75%)

2 (28.5%)

99 (31.8%)

CTX-M-8 alone

59 (27.9%)

0 (0%)

0 (0%)

0 (0%)

59 (19%)

CTX-M-8 + 15

10 (4.7%)

0 (0%)

0 (0%)

3 (42.8%)

13 (4.2%)

CTX-M-2 alone

1 (.5%)

1 (1.8%)

0 (0%)

0 (0%)

2 (0.6%)

CTX-M-2 + 15

0 (0%)

0 (0%)

2 (5%)

0 (0%)

2 (0.6%)

Total

171 (81%)

42 (79.2%)

35 (87.5%)

6 (85.7%)

254 (81.7%)

Other β-lactamase genes

blaSHV only

15(7.1%)

0(0%)

1(2.5%)

1(14.2%)

17 (5.4%)

blaTEM only

13(6.1%)

3(5.6%)

0 (0%)

0(0%)

16(5.1%)

blaTEM + SHV

10(4.7%)

7(13.2%)

4(10%)

0(0%)

21(6.7%)

Combinations

blaSHV+ CTX-M

55(26.1%)

20(37.7%)

7(17.5%)

1(14.2%)

83(26.7%)

blaTEM + CTX-M

102(48.3%)

13(24.5%)

21(52.5%)

4(57.1%)

140(45%)

TEM + SHV + CTX-M

1(.4%)

5(9.4%)

5(12.5%)

1(14.2%)

12(2.2%)

CTX-M genes only

13(6.1%)

4(7.5%)

2(5%)

0(0%)

19 (6.1%)