Inclusion Criteria:  Diagnosed primarily with community-acquired pneumonia as per the ED MD. Must have a CXR done.  They also must have any one of:  tachypnoea; cough; increased work of breathing; or auscultatory findings consistent with pneumonia; Participants must be well enough to be treated as outpatients.  Exclusion Criteria:  Participants will be excluded if they are presenting with: cystic fibrosis, anatomic lung disease, bronchiectasis, congenital heart disease (requiring medical treatment, supplemental oxygen, or with exercise restrictions), history of repeated aspiration or velopharyngeal incompetence, malignancy (current or past), conditions requiring treatment with immune suppressants, primary immunodeficiency, advanced HIV infection, prolonged admissions (>48 h) to hospital within the past 2 months, pneumonia previously diagnosed within the past month, or lung abscess diagnosed within the past six months. Children who present with ongoing fever after 4 or more days of beta-lactam therapy active against S. pneumoniae (ie. amoxicillin, amoxicillin-clavulanate, cefprozil, cephalexin, or cefadroxil), levofloxacin, moxifloxacin, or doxycycline will not be eligible. Children will not be eligible to participate more than once.