We evaluated in vitro activity of ceftolozane-tazobactam (TOL-TAZ), formerly CXA-201, against recent clinical anaerobic isolates with emphasis on the Bacteroides fragilis group. Ceftolozane-tazobactam showed good activity against B. fragilis species and intermediate to limited activity against other species of Bacteroides. Ceftolozane-tazobactam showed very good activity against Prevotella spp., Fusobacterium spp., and Propionibacterium spp., varying activities against Gram-positive cocci, and limited activity against Clostridium spp.
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Snydman et al. (2013) studied this question.
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