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[Activity of cefpirome against bacteria isolated from hospitalized patients].

The activity of cefpirome (HR 810) was evaluated against 247 strains isolated from patients developing their infections while in a hospital in Buenos Aires. Its activity against Gram negative bacilli was compared with ceftriaxone, ceftazidime, cephalotin, piperacillin, amikacin, gentamicin and norfloxacin. In terms of MIC50 and MIC90 (mg/l) it was as follows: Klebsiella pneumoniae: less than 0.125, less than 2.0; Pseudomonas aeruginosa: less than 8, less than 16; Escherichia coli: less than 0.016, less than 0.063; Serratia marcescens: less than 0.063, less than 1.0; Enterobacter cloacae: less than 0.125, less than 1.0. Cefpirome was more active than the other cephalosporins against P. aeruginosa: at 16 mg/l, this drug inhibited 95% of strains versus 60% for ceftazidime and 32% for ceftriaxone. Activity of norfloxacine against Gram negative bacilli was similar to cefpirome, while piperacillin and the aminoglycosides were less active. Cefpirome was more active than cepahallotin against Streptococcus faecalis (2.0, 32) although less active than ampicillin, piperacillin, rifampicin and vancomycin. Against methicillin-susceptible Staphylococcus aureus (less than 0.25, less than 1.0) it was more active than cephalotin and the other drugs evaluated (piperacillin, erythromycin, chloranphenicol, aminogycosides). Like cephalotin, the activity of cefpirome against methicillin-resistant strains was variable (1.0, 32).