Activity of gemifloxacin and other new quinolones against Chlamydia pneumoniae: a review.

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Abstract
Quinolones are currently used as empirical therapy for treatment of community-acquired lower respiratory infections as they are effective against a broad range of conventional bacterial and ‘atypical’ pathogens, including Chlamydia pneumoniae. C. pneumoniae is estimated to be associated with 10–20% of community-acquired pneumonia in adults, and has recently been suggested to play a role in several non-respiratory conditions, including atherosclerosis. The newer, third-generation quinolones have enhanced activity against Gram-positive bacteria, including Streptococcus pneumoniae, and prolonged serum half-lives that permit once-daily dosing. Although gemifloxacin (SB-265805) and other new quinolones have good activity against C. pneumoniae in vitro, practically all published treatment studies have relied on serological diagnosis. Consequently, the microbiological efficacy of these agents in human infection has not been assessed. This paper reviews what is known to date of the in vivo microbiological efficacy of the quinolones against C. pneumoniae, and demonstrates the importance of assessing this parameter when evaluating the clinical utility of these agents in C. pneumoniae infection.

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