Abstract
A multicenter, collaborative study was performed over a three-year period (1992-1994) to determine the antimicrobial susceptibilities of isolates of Haemophilus influenzae, Moraxella catarrhalis, and Streptococcus pneumoniae from community-acquired lower respiratory tract infections. Isolates were collected from five geographically separated medical centers in the United States and sent to a central laboratory for antimicrobial susceptibility testing. Of 350, 536, and 372 isolates of H. influenzae collected from the five centers in 1992, 1993, and 1994, 26.3%, 28.2%, and 30.1%, respectively, were beta-lactamase-positive. All isolates of H. influenzae remained susceptible to ceftriaxone, doxycycline, ciprofloxacin, and ofloxacin over the three-year period. Between 95 and 100% of isolates of H. influenzae remained susceptible to amoxicillin-clavulanic acid cefixime, clarithromycin, and chloramphenicol over this same period. The prevalence of beta-lactamase-positive isolates of M. catarrhalis increased from 92.1% in 1992 to 93.8% in 1993 and to 96.5% in 1994; however, isolates of this species were highly susceptible to amoxicillin-clavulanic acid, the cephalosporins, the macrolides, the fluoroquinolones, chloramphenicol, doxycycli...Continue Reading
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