In-vitro activity of the monobactam Ro 17-2301 against clinical isolates of Enterobacteriaceae and Pseudomonas aeruginosa.

Ro 17-2301 is a monobactam antibiotic. Its in-vitro activity was compared with those of aztreonam, ampicillin, cefuroxime, ceftriaxone, ceftazidime, and gentamicin. Ro 17-2301 had qualitatively similar activity to aztreonam and activity superior to that all the other antibiotics against the Enterobacteriaceae, but against Pseudomonas aeruginosa ceftazidime had equal or marginally better activity.