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The activity of cefmenoxime (SCE-1365), 7 beta-[2-(2-aminothiazol-4-yl)-(Z)-2-methoxyiminoacetamido]-3-[(1-methyl-1H-tetrazol-5-yl)thiomethyl]ceph-3-em-4-carboxylic acid, was compared with that of other cephalosporins. Cefmenoxime exhibited high activity against a wide variety of gram-positive and gram-negative bacteria. The in vitro activity of cefmenoxime against Streptococcus pyogenes, Haemophilus influenzae, and Enterobacteriaceae, including indole-positive Proteus, Serratia marcescens, Enterobacter cloacae, and Citrobacter freundii, was 10 to 1,000 times greater than that of several other cephalosporins. Against Pseudomonas aeruginosa, cefmenoxime showed activity two to four times that of sulbenicillin and carbenicillin but less than that of cefsulodin. Variation in pH, addition of horse serum, and type of growth medium had definite effects on the activity of cefmenoxime, and the inoculum size affected the activity against bacterial species. In Escherichia coli cefmenoxime showed marked affinity for penicillin-binding protein 3 (PBP-3), followed by PBP-1 (1A and 1B). This affinity profile was well correlated with its filamentous cell-forming activity under extremely low drug concentrations and with its bactericidal activity against microorganisms. The high in vitro activity of cefmenoxime was reflected in the degree of protection observed in mice infected intraperitoneally with a wide variety of gram-positive and gram-negative bacteria. Furthermore, cefmenoxime showed good therapeutic activity against infection models in mice such as respiratory tract infection caused by Klebsiella pneumoniae and urinary tract infection caused by Proteus mirabilis.

Cefmenoxime (SCE-1365), a novel broad-spectrum cephalosporin: in vitro and in vivo antibacterial activities