Comparative in vitro activity of telithromycin and beta-lactam antimicrobials against bacterial pathogens from community-acquired respiratory tract infections: data from the first year of PROTEKT (1999-2000).
The in vitro activity of telithromycin, a new ketolide, was compared with beta-lactam antimicrobials against pathogens commonly associated with community-acquired respiratory tract infections. These pathogens were collected during 1999-2000 as part of the ongoing PROTEKT surveillance study. Globally, penicillin nonsusceptibility among Streptococcus pneumoniae (n = 3362) was 36.3%, ranging from 21.5% (Australasia) to 68.0% (Far East). Telithromycin showed higher potency (MIC90 0.12 mg/L) than beta-lactams against S. pneumoniae; 99.9% of all and 99.6% of multi-resistant isolates were susceptible to telithromycin. Among Streptococcus pyogenes isolates (n = 1485), 100% were susceptible to beta-lactams, and the telithromycin MIC50 and MIC90 were both 0.015 mg/L. Among Haemophilus influenzae (n = 2948), 16.6% produced beta-lactamase, which reduced the activity of ampicillin, cefaclor and cefprozil. 99.9% of H. influenzae were susceptible to telithromycin and the MIC range for M. catarrhalis was 0.004-0.5 mg/L. The first year results of PROTEKT confirmed high potency for telithromycin against common respiratory tract pathogens, including beta-lactam-resistant strains.
Kohno
S
S
Second Dept of Internal Medicine, Nagasaki University School of Medicine, Sakamoto, Japan. s-kohno@net.nagasaki-u.ac.jp
Hoban
D
D
D000900:Anti-Bacterial Agents / Q000494:pharmacology* / Q000627:therapeutic use; D017714:Community-Acquired Infections / Q000188:drug therapy* / Q000382:microbiology; D006801:Humans; D066298:In Vitro Techniques; D048628:Ketolides; D018942:Macrolides / Q000494:pharmacology* / Q000627:therapeutic use; D008826:Microbial Sensitivity Tests; D012141:Respiratory Tract Infections / Q000188:drug therapy* / Q000382:microbiology; D018440:beta-Lactam Resistance; D001618:beta-Lactamases / Q000187:drug effects*
D000900:Anti-Bacterial Agents; D048628:Ketolides; D018942:Macrolides; D001618:beta-Lactamases; C106791:telithromycin