title: Activity of BMS284756 (T-3811) tested against anaerobic bacteria, Campylobacter jejuni, Helicobacter pylori and Legionella spp.
abstract: BMS284756, a novel des-fluoro (6) quinolone (formerly T-3811), was tested for activity and spectrum using reference agar dilution (AD) and Etest (AB BIODISK, Solna, Sweden) methods. The antimicrobial activities of BMS284756, ciprofloxacin, gatifloxacin, levofloxacin, and trovafloxacin were evaluated against Campylobacter jejuni (38 strains), Helicobacter pylori (21 strains), Legionella spp. (66 strains), and 197 anaerobic isolates. BMS284756 (MIC(90), 0.008 microg/mL) was four-fold more active than gatifloxacin and trovafloxacin against H. pylori strains. Gatifloxacin and BMS284756 (MIC(50), 0.03 microg/mL) were > or = two-fold more active than levofloxacin against C. jejuni, but their spectrums were judged equivalent overall (89.4% susceptible). Against the Legionella spp., ciprofloxacin and levofloxacin (MIC(90), 0.25 microg/mL) had two-fold greater activity compared to gatifloxacin or BMS284756, but all strains were considered inhibited at clinically achievable levels. BMS284756 and trovafloxacin (MIC(90), 2 and 4 microg/mL, respectively) were four-to-eight-fold more potent than other comparators against the Gram-negative anaerobic species. Against the Gram-positive anaerobes (dominated by Clostridium difficile; 61 strains), BMS284756 activity was generally reduced, but equivalent or superior to trovafloxacin (68% inhibited at < or = 4 microg/mL). Inter-method comparisons (Etest versus AD) of BMS284756 MIC values showed a high correlation for C. jejuni and anaerobes (93.3 to 97.6% +/- two log (2) dilution steps). In conclusion, BMS284756 was very active against C. jejuni, H. pylori, Legionella spp. and most anaerobes, thus the potential role of this des-fluoro compound for treatment of infections caused by these fastidious species warrants further investigation.
authors.affiliation: University of Iowa College of Medicine, Iowa City, IA, USA.
authors.forename: P R
authors.initials: PR
authors.lastname: Rhomberg
authors.forename: D J
authors.initials: DJ
authors.lastname: Biedenbach
authors.forename: R N
authors.initials: RN
authors.lastname: Jones
mesh_terms: D000890:Anti-Infective Agents / Q000737:chemistry / Q000494:pharmacology*; D001421:Bacteria, Anaerobic / Q000187:drug effects*; D016123:Campylobacter jejuni / Q000187:drug effects*; D024841:Fluoroquinolones; D016480:Helicobacter pylori / Q000187:drug effects*; D006801:Humans; D007211:Indoles; D007875:Legionella / Q000187:drug effects*; D008826:Microbial Sensitivity Tests / Q000379:methods / Q000592:standards; D015363:Quinolones
chemical_list: D000890:Anti-Infective Agents; D024841:Fluoroquinolones; D007211:Indoles; D015363:Quinolones; C419689:garenoxacin