Resistens mod cephalosporiner er resultatet af enzymatisk inaktivering (β- lactamase produktion), fra reduceret permeabilitet ved mutation af porer eller ændring i efflux, eller fra selektion af penicillinbindende proteiner med lav affinitet.
Resistance to cephalosporins results from enzymatic inactivation (β -lactamase production), from reduced permeability by porin mutations or change in efflux, or by selection of low-affinity penicillin- binding proteins.