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In page Ceftolozane/tazobactam:

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The in vitro activity of ceftolozane–tazobactam has been examined in five surveillance studies of isolates from Europe and North America.[1] In these studies, ceftolozane–tazobactam was notable for its activity against Pseudomonas aeruginosa, a common cause of hospital-acquired infections that is commonly multi-drug resistant. Ninety percent of Pseudomonas aeruginosa isolates were inhibited by a ceftolozane–tazobactam at a concentration of 4 μg/mL (MIC90), making it the most potent anti-pseudomonal antibiotic in clinical use.[citation needed]