blaACT is a plasmid-mediated AmpC beta-lactamase that hydrolyzes cephalosporins, including third-generation drugs. Like other AmpC enzymes, it is not inhibited by clavulanate or tazobactam.
Detection of blaACT in molecular testing identifies organisms requiring carbapenems or newer beta-lactam/inhibitor combinations for effective treatment. Sample type is typically a culture isolate or direct clinical specimen.