Comparative in vitro microbiological activity and stability of cefaclor.

The in vitro activity of cefaclor was compared with that of cephalexin and cephradine. This new antibiotic was the most active of the oral agents against Haemophilus influenzae (especially non-beta-lactamase producing strains). It was also significantly more active against N. gonorrhoeae and the Enterobacteriaceae. The instability in agar raises some issues that need further study.