Antimicrobial susceptibility by Etest of Bartonella henselae isolated from cats and human in Japan.
Bartonella henselae, a small fastidious Gram-negative bacillus, is the causative agent of cat-scratch disease (CSD). Because of difficulty in isolating the organism, there has been no report on its antibiotic susceptibility in Japan. We determined the minimal inhibitory concentrations (MICs) of eight antimicrobial agents against 32 isolates of B. henselae (31 from cats and one from a human in Japan) by the Etest method. MICs of all 32 isolates were <0.016 μg/ml for minocycline and ranged from ≤0.016 to 0.064 μg/ml for erythromycin, clarithromycin, azithromycin, ceftriaxone, and amoxicillin. MICs ranges of ciprofloxacin and gentamicin were from 0.064 to 0.25 μg/ml and from 0.5 to 3 μg/ml, respectively. All isolated strains showed high susceptibility to minocycline and macrolides antibiotics, which are currently used in the primary treatment of CSD in Japan. Although in vitro result of B. henselae susceptibility testing may not necessarily correlate with clinical response, these data are relevant in the choice of drugs for CSD treatment.
Tsuneoka
Hidehiro
H
Department of Clinical Laboratory Science, Graduate School of Medicine, Yamaguchi University, 1-1-1 Minami-kogushi, Ube, Yamaguchi 755-8505, Japan. htsune@yamaguchi-u.ac.jp
Yanagihara
Masashi
M
Nojima
Junzo
J
Ichihara
Kiyoshi
K
D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D018416:Bartonella henselae / Q000187:drug effects* / Q000302:isolation & purification*; D002371:Cat Diseases / Q000188:drug therapy / Q000382:microbiology*; D002372:Cat-Scratch Disease / Q000188:drug therapy / Q000382:microbiology*; D002415:Cats; D006801:Humans; D007564:Japan; D018942:Macrolides / Q000494:pharmacology; D008826:Microbial Sensitivity Tests / Q000379:methods
D000900:Anti-Bacterial Agents; D018942:Macrolides