Cephamycins (cefoxitin and cefotetan) are not hydrolyzed by majority of ESBLs, but are hydrolyzed by associated AmpC-type β-lactamase.
As cefamicinas (cefoxitin e cefotetan) non son hidrolizadas pola maioría das ESBL, mais son hidrolizadas por β-lactamases de tipo AmpC asociadas.