In vitro activity of clinafloxacin against fluoroquinolone resistant Spanish clinical isolates.
The in vitro activity of clinafloxacin against 162 ciprofloxacin-resistant clinical isolates was determined. Isolates were selected when their MIC to ciprofloxacin was 2 mg/l (intermediate) or > 2 mg/l (resistant). The following strains were tested: 61 Escherichia coli, 12 Klebsiella pneumoniae, 7 Proteus mirabilis, 21 Serratia marcescens, 4 Enterobacter cloacae, 21 Pseudomonas aeruginosa, 21 Staphylococcus. aureus (resistant to methicillin) and 15 Enterococcus spp. Clinafloxacin, ciprofloxacin, ofloxacin and norfloxacin activities were evaluated by agar dilution using Müeller-Hinton agar according to NCCLS recommendations. Of the 162 isolates, 16 (9.8%) were intermediate and 146 (90.1%) resistant to ciprofloxacin. 95 of the 162 strains (58.6%) were susceptible, 27 (16.7%) intermediately susceptible, and 40 strains (24.7%) were resistant to clinafloxacin. The percentage susceptible to clinafloxacin was 65.6% for E. coli, 75% for K. pneumoniae, 71.4% for P. mirabilis, 28.6% for S. marcescens, 75% for E. cloacae, 33.3% for P. aeruginosa, 90.5% for S. aureus and 40% for Enterococcus spp. Clinafloxacin was active against 58.6% of the ciprofloxacin-resistant clinical isolates tested. It was particularly active against S. aureus strains resistant to both ciprofloxacin and methicillin.
López-Brea
M
M
Department of Microbiology, Hospital Universitario de la Princesa, Madrid, Spain. mlbrea@microb.net
Prieto
N
N
Domingo
D
D
de las Cuevas
C
C
Sánchez
I
I
Alarcón
T
T
D000890:Anti-Infective Agents / Q000494:pharmacology*; D004352:Drug Resistance, Microbial; D024841:Fluoroquinolones; D006090:Gram-Negative Bacteria / Q000187:drug effects* / Q000302:isolation & purification; D016905:Gram-Negative Bacterial Infections / Q000382:microbiology; D016908:Gram-Positive Bacterial Infections / Q000382:microbiology; D006095:Gram-Positive Cocci / Q000187:drug effects* / Q000302:isolation & purification; D006801:Humans; D008826:Microbial Sensitivity Tests; D013030:Spain
D000890:Anti-Infective Agents; D024841:Fluoroquinolones; C057477:clinafloxacin