Studies on the OA-6129 group of antibiotics, new carbapenem compounds. II. In vitro evaluation.

The OA-6129 group of antibiotics, new carbapenem compounds, had relatively potent antimicrobial activities against Gram-positive and Gram-negative bacteria. Synergism of compound OA-6129A in combination with conventional beta-lactam antibiotics was observed in antimicrobial activity against beta-lactamase producers such as Proteus vulgaris GN 76 and Citrobacter freundii GN 346. The new carbapenem compounds were slightly superior to PS-5 in stability to kidney homogenates of various animal species.