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Table 5 Frequency of AmpC genes among cefoxitin-resistant isolates and its combinations with ESBL genes

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

AmpC genes E. coli (n = 18) K. pneumoniae (n = 12) Citrobacter spp. (n = 5) AmpC positive (n = 35) Associated
ESBL genes
MOX 0(0%) 1(8.3%) 0(0%) 1(2.8%) CTX-M-1 + 15
FOX 0(0%) 0(0%) 0(0%) 0(0%)  
DHA 9 (50%) 3(25%) 0(0%) 12(34.3%) CTX-M-15 (6)
CTX-M-1 (3)
TEM (2)
No ESBL genes (1)
CIT 0(0%) 1(8.3%) 0(0%) 1(2.8%) CTX-M-1 + 15+ TEM
DHA+ CIT 0(0%) 1(8.3%) 0(0%) 1(2.8%) CTX-M-1 + 15
MOX + CIT 0(0%) 1(8.3%) 0(0%) 1(2.8%) CTX-M-1 + 15 + TEM
MOX + CIT+ DHA 0(0%) 2(16.6%) 0(0%) 2(5.6%) CTX-M-1 + 15
Total 9(50%) 9(75%) 0(0%) 18(51.4%) (17/18, 94.4%)