title: The activity of the methylpiperazinyl fluoroquinolone CG 5501: a comparison with other fluoroquinolones.
abstract: The in-vitro activity of CG 5501 against a wide range of recent clinical isolates was compared with that of three fluoroquinolones. CG 5501 inhibited 90% of the species of the family Enterobacteriaceae at 0.5 mg/L or less, exceptions being Enterobacter spp. (MIC90 2 mg/L) and Serratia spp. (MIC90 4 mg/L). Ninety per cent of Pseudomonas aeruginosa, Stenotrophomonas maltophilia and Acinetobacter spp. were inhibited by 16, 4 and 1 mg/L respectively. CG 5501 had high activity against Gram-positive cocci, 90% of staphylococci being inhibited at 2 mg/L. Methicillin-resistant Staphylococcus aureus strains were generally ciprofloxacin-resistant yet were all susceptible to 4 mg/L or less of CG 5501. Isolates of Streptococcus pneumoniae were eight-fold more susceptible to CG 5501 (MIC90 0.5 mg/L) than to ciprofloxacin (MIC90 4 mg/L) and the former had a similar activity to that of trovafloxacin and sparfloxacin. Enterococcus faecalis was generally two- to four-fold more susceptible to CG 5501 or trovafloxacin than to ciprofloxacin. CG 5501 and trovafloxacin had high activity against Bacteroides fragilis (MIC90 0.25 mg/L). Five strains of Chlamydia spp. were inhibited by < or =0.12 mg/L of CG 5501; sensitive and multiresistant strains of Mycobacterium tuberculosis were inhibited by < or =0.5 mg/L of CG 5501. The high activity and breadth of its antibacterial spectrum suggests that CG 5501 should be useful in a wide range of clinical infections.
authors.affiliation: Department of Microbiology, City Hospital NHS Trust, Birmingham, UK.
authors.forename: R
authors.initials: R
authors.lastname: Wise
authors.forename: N P
authors.initials: NP
authors.lastname: Brenwald
authors.forename: J M
authors.initials: JM
authors.lastname: Andrews
authors.forename: F
authors.initials: F
authors.lastname: Boswell
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology; D000890:Anti-Infective Agents / Q000494:pharmacology*; D017963:Azithromycin / Q000494:pharmacology; D001441:Bacteroides fragilis / Q000187:drug effects; D002689:Chlamydia / Q000187:drug effects; D002939:Ciprofloxacin / Q000494:pharmacology; D017291:Clarithromycin / Q000494:pharmacology; D004318:Doxycycline / Q000494:pharmacology; D004754:Enterobacter / Q000187:drug effects; D004917:Erythromycin / Q000494:pharmacology; D024841:Fluoroquinolones; D000077734:Gatifloxacin; D006094:Gram-Positive Bacteria / Q000187:drug effects; D006193:Haemophilus influenzae / Q000187:drug effects; D008826:Microbial Sensitivity Tests; D009287:Naphthyridines / Q000494:pharmacology; D010879:Piperazines / Q000494:pharmacology*; D011550:Pseudomonas aeruginosa / Q000187:drug effects; D015363:Quinolones / Q000494:pharmacology*; D013296:Streptococcus pneumoniae / Q000187:drug effects
chemical_list: D000900:Anti-Bacterial Agents; D000890:Anti-Infective Agents; D024841:Fluoroquinolones; D009287:Naphthyridines; D010879:Piperazines; D015363:Quinolones; D002939:Ciprofloxacin; D004917:Erythromycin; D017963:Azithromycin; C080163:trovafloxacin; D017291:Clarithromycin; D000077734:Gatifloxacin; D004318:Doxycycline; C061363:sparfloxacin