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Antimicrobial agents and chemotherapy

Antibacterial activity of WY-49605 compared with those of six other oral agents and selection of disk content for disk diffusion susceptibility testing.


PMID 7492088

Abstract

The in vitro antimicrobial activity of an oral penem, WY-49605, was compared with those of six other oral antimicrobial agents against 598 bacterial isolates representing 51 different species. WY-49605 exhibited good activity against most gram-positive bacteria and members of the family Enterobacteriaceae. It had little activity against nonfermenting gram-negative bacilli, Enterobacter spp., Serratia spp., enterococci, Staphylococcus haemolyticus, and methicillin-resistant Staphylococcus aureus. Its activity was unaffected by the beta-lactamases of Neisseria gonorrhoeae, Haemophilus influenzae, and staphylococci. Disk diffusion susceptibility tests were performed with 5-, 10-, 15-, and 30-micrograms WY-49605 disks. The 5-micrograms disk is recommended, with tentative breakpoints of > or = 16 mm for susceptibility (MIC, < or = 2.0 microgram/ml) and < or = 12 mm for resistance (MIC, > or = 8.0 micrograms/ml).

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