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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%)