CAP is an infection of the pulmonary parenchyma acquired outside of a health care setting. CAP is common, with more than 1.5 million adults hospitalized annually, and is the most common infectious cause of death in the US.1
CAP is a heterogeneous illness, both in illness severity and pathogens. The most common bacterial pathogens are Streptococcus pneumoniae, Haemophilus influenzae, Mycoplasma pneumoniae, S aureus, Legionella species, Chlamydia pneumoniae, and Moraxella catarrhalis. However, the microbiologic etiology of CAP is evolving, with increasing recognition of the role of viral pathogens using molecular detection methods.
Olson G, Davis AM. Diagnosis and Treatment of Adults With Community-Acquired Pneumonia. JAMA. 2020;323(9):885–886. doi:10.1001/jama.2019.21118
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