Extended spectrum beta lactamases (ESBLs) are characterized by activity against all except:: (A) Penicillinases, (B) Cephalosporinases, (C) Oxyimino-cephalosporinases, (D) Carbapenems
Answer is D. CARBAPENEMS: lmipenem :It is an extremely potent and broad-spectrum Beta-lactam antibiotic whose range of activity includes grampositive cocci, Enterobacteriaceae, Ps. aeruginosa, Listeri.