Table 2. Concordance rates between resistance phenotype to cephalosporins and genotypes of CTX-M and PACBL

Ann Clin Microbiol 2022;25:119-124. Predicting phenotypic antimicrobial resistance in Escherichia coli isolates, using whole genome sequencing data

Table 2. Concordance rates between resistance phenotype to cephalosporins and genotypes of CTX-M and PACBL

CTX-M type	CTX-R % (n)	CAZ-R % (n)	CEF-R % (n)	FOX-R % (n)	AZT-R % (n)
CTX-M-1 (n=11)	100 (11)	0	18 (2)	0	18 (2)
CTX-M-14 (n=29)	100 (29)	0	4 (1)	0	0
CTX-M-15 (n=8)	100 (8)	25 (2)	88 (7)	0	100 (8)
CTX-M-27 (n=3)	100 (3)	0	67 (2)	0	67 (2)
CTX-M-55 (n=24)	100 (24)	42 (10)	75 (18)	0	79 (19)
CMY-2 plus CTX-M-55 (n=4)	100 (4)	100 (4)	0	100 (4)	100 (4)
CTX-M-65 (n=5)	100 (5)	0	0	0	20 (1)

Abbreviations: PACBL, plasmid-mediated AmpC-like β-lactamase; CTX-R, phenotypic resistance to cefotaxime; CAZ-R, phenotypic resistance to cefotazidime; CEF-R, phenotypic resistance to cefepime; FOX-R, phenotypic resistance to cefoxitin; AZT-R, phenotypic resistance to aztreonam.