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Antimicrobial activity of dactimicin in vitro compared with that of dibekacin, netilmicin, sisomicin and micronomicin.

Antimicrobial activity of dactimicin, a pseudo-disaccharide aminoglycoside antibiotic, was compared with those of dibekacin, netilmicin, sisomicin and micronomicin using clinical isolates of four Gram-positive and sixteen Gram-negative bacteria. Dactimicin was more active than the reference amino-glycosides against Serratia marcescens, especially gentamicin-resistant Serratia sp., Proteus vulgaris, P. rettgeri and Klebsiella oxytoca, but less active against Pseudomonas aeruginosa and P. mirabilis. Dactimicin was equally active as the references excepting netilmicin against Gram-positive bacteria and some Gram-negative bacteria including Escherichia coli, K. pneumoniae, Morganella morganii, Haemophilus influenzae, Citrobacter freundii, Enterobacter aerogens, E. cloacae, Acinetobacter calcoaceticus and Campylobacter jejunii. Dactimicin was active against resistant strains possessing various aminoglycoside-modifying enzymes including AAC(3)-1, by which dactimicin was acetylated.