[In vitro activity of a new cephalosporin--cefoperazone--against Enterobacteriaceae and Pseudomonas aeruginosa].

431 recent clinical isolates from the families Enterobacteriaceae and Pseudomonadaceae drawn from the western part of Switzerland have been tested for Cefoperazone sensitivity. With 6 exceptions, all strains were susceptible or highly sensitive to the antibiotic. Striking was the excellent activity of cefoperazone against Pseudomonas aeruginosa, Serratia marcescens and indol-positive Proteus species, in contrast that of most of the already established cephalosporins.