In vitro susceptibility of gram-negative bacilli towards six newer cephalosporins.

The in-vitro activities of six newer cepl~alosporins against 459 recently isolated strains of Gram-negative bacilli were determined using an agar dilution method to establish minimum inhibitory concentrations (mics). The cephalosporins tested were cefotaxime, moxalactam,cefoperazone, ceftriaxone, cefsulodin and ceftazidio~e. The strains tested included Enterobacteriaceae, Pscudornorlas aerugimsu and Acinetobacter calcoaceticus. All the cephalosporins tested showed good activity against Enterobacteriaceae with the exception of cefsulodin which was specifically antipseudo~nonal.