In vitro activity of FCE 22101, imipenem, and ceftazidime against over 6,000 bacterial isolates and MIC quality control limits of FCE 22101

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Abstract
Six geographically separate laboratories within the USA tested 6,198 bacterial isolates against FCE 22101 (a penem), imipenem (a carbapenem) and ceftazidime (a third-generation cephalosporin). Ninety-three percent of 2,749Enterobacteriaceae were inhibited by FCE 22101, while 95 % were susceptible to ceftazidime and 99 % were susceptible to imipenem. FCE 22101 had little activity againstPseudomonas spp. but was active against most gram-positive pathogens, including enterococci. FCE 22101 MICs for standard quality control strains were defined as 0.5–2.0µg/ml forEscherichia coli ATCC 25922, 2–8µg/ml forEnterococcus faecalis ATCC 29212 and 0.06–0.25µg/ml forStaphylococcus aureus ATCC 29213.