TABLE 1

Genotyped β-lactamases and combinations in ESBL-positive isolates of E. coli (n = 114) and K. pneumoniae (n = 151), excluding non-ESBL SHVs and TEMs

β-LactamaseaNo. of isolates
No additional β-lactamaseAdditional CTX-M β-lactamaseAdditional SHV β-lactamase
E. coliK. pneumoniaeE. coliK. pneumoniaeE. coliK. pneumoniae
CTX-M967524c
SHV410
TEM11
KPC2301b6d9b
VIM11
AmpC2411
OXA122
  • a The β-lactamase genes identified included CTX-M-1, -9, -14, -15, -22, -27, -32, -61, -55, and -181; SHV-2, -2A, -7, -12, and -28; TEM-24 and -28; KPC-2 and -3; VIM-1; and the AmpCs CMY-type, ACC-1, DHA-7; and OXA-48 and -232.

  • b One isolate with an additional AmpC.

  • c Two isolates with an additional OXA.

  • d One isolate with an additional OXA.