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Chlamydia pneumoniae causes pneumonia and bronchitis
C pneumoniae causes up to 20% (depending on the study) of community-acquired pneumonias
C pneumoniae is second only to mycoplasma as an agent of atypical pneumonia
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Strains of C pneumoniae are resistant to sulfonamides
When a diagnosis of C pneumoniae is confirmed, azithromycin (500 mg orally on day 1 and 250 mg daily for 4 more days) is the recommended treatment
Doxycycline (100 mg orally or intravenously two times daily) or levofloxacin (750 mg orally or intravenously once daily), each given for approximately 7–10 days, are also expected to be effective
It is unclear if empiric coverage for atypical pathogens in hospitalized patients with community-acquired pneumonia provides a survival benefit or improves clinical outcome