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  • Title: In vitro activity and beta-lactamase stability of a new difluoro oxacephem, 6315-S.
    Author: Neu HC, Chin NX.
    Journal: Antimicrob Agents Chemother; 1986 Nov; 30(5):638-44. PubMed ID: 3492172.
    Abstract:
    6315-S, a novel difluoromethyl thioacetamido oxacephem, had in vitro activity comparable to that of cefotaxime and moxalactam against Escherichia coli, Klebsiella pneumoniae, Proteus mirabilis, Klebsiella oxytoca, Citrobacter diversus, Salmonella spp., and Shigella spp., inhibiting 90% at less than or equal to 0.25 microgram/ml. It inhibited piperacillin- and cefoperazone-resistant isolates in these species. 6315-S did not inhibit cefotaxime- or moxalactam-resistant Citrobacter freundii, Enterobacter aerogenes, or Enterobacter cloacae (MICs for 90% of the strains tested were greater than or equal to 16 micrograms/ml). Proteus vulgaris resistant to cefotaxime was inhibited. Pseudomonas species and Acinetobacter species were resistant (MICs greater than 64 micrograms/ml). MICs for 90% of the Staphylococcus aureus and S. epidermidis isolates were 4 micrograms/ml. 6315-S was highly active against anaerobic species of Clostridium, Fusobacterium, Bacteroides, and peptostreptococci and was superior to other agents against these organisms. 6315-S was not hydrolyzed by the major plasmid and chromosomal beta-lactamases, but it induced chromosomal beta-lactamases in Enterobacter cloacae and Pseudomonas aeruginosa.
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