In-vitro activity of ceftolozane/tazobactam against recent clinical bacterial isolates from two Saudi Arabian hospitals.

Background: Antimicrobial resistance is continuously increasing. Adding tazobactam to ceftolozane improves the latter's activity spectrum against resistant strains. We aimed to determine the susceptibility of recently collected bacterial isolates to ceftolozane/tazobactam (C/T) and other antibiotics.