BL-S 640, a Cephalosporin with a Broad Spectrum of Antibacterial Activity: Properties In Vitro

Abstract
BL-S 640 was evaluated in vitro by comparison with cephalothin, cephaloridine, cefazolin, and cephalexin. The new compound was more active than the control cephalosporins against most major gram-negative and some gram-positive species. Moreover, its antibacterial spectrum included strains of Enterobacter, Proteus morganii, P. rettgeri , and Providencia stuartii , species generally resistant to the other cephalosporins. BL-S 640 was an effective bactericidal agent for strains of various species of Enterobacteriaceae . In human plasma, the compound was 58% protein bound.