title: In vitro and in vivo antibacterial activities of FR-31564, a new phosphonic acid antibiotic.
abstract: FR-31564, a new phosphonic acid antibiotic, was active against most Gram-negative bacteria except Serratia marcescens and glucose-nonfermenting Gram-negative rods excluding Pseudomonas aeruginosa. The antibacterial activity in vitro of FR-31564 was stronger than that of fosfomycin especially against Escherichia coli, Klebsiella pneumoniae, Enterobacter species and P. aeruginosa. FR-31564 also was active against Gram-negative bacteria resistant to beta-lactam antibiotics and against gentamicin-resistant strains of P. aeruginosa. The antibacterial activity in vitro of FR-31564, like that of fosfomycin, was enhanced when 10% rabbit blood was added to the nutrient agar. The therapeutic efficacy of FR-31564 in experimental infections in mice was superior to that of fosfomycin in infections due to most Gram-negative bacteria used, and was similar to that of gentamicin in infections due to Citrobacter freundii, Proteus rettgeri and Proteus inconstans B. The protective effect of FR-31564, particularly in the P. aeruginosa infection, was superior to that of other control drugs including gentamicin.
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001419:Bacteria / Q000187:drug effects; D001424:Bacterial Infections / Q000382:microbiology / Q000517:prevention & control; D003470:Culture Media; D004352:Drug Resistance, Microbial; D005578:Fosfomycin / Q000031:analogs & derivatives / Q000097:blood / Q000494:pharmacology* / Q000627:therapeutic use; D006863:Hydrogen-Ion Concentration; D051379:Mice; D008813:Mice, Inbred ICR; D011817:Rabbits
chemical_list: D000900:Anti-Bacterial Agents; D003470:Culture Media; D005578:Fosfomycin; C024640:fosmidomycin