Azithromycin Versus Doxycycline in Hospitalized Adult Patients With Community Acquired Pneumonia Treated With Beta-lactams

Who May Qualify: • All adult patients (\>18 years old) admitted with CAP and receiving a beta-lactam antibiotic plus a form of atypical coverage (azithromycin or doxycycline) in the ED within 12 hours of admission. Who Should NOT Join This Trial: - High clinical suspicion for Legionella pneumonia - Allergy or contraindication to the use of either azithromycin or doxycycline (usual clinical practice) - Antibiotics not for CAP - Pregnant women (based on clinical assessment as part of standard of care) - Severe CAP as defined by the ATS/IDSA criteria - Corrected QT prolongation (\> 440 ms in men and \> 460 ms in women) - Receiving a different antibiotic (e.g quinolones) - Admission \> 24 hours - Known to be a prisoner Always talk to your doctor about whether this trial is right for you.