The organism most commonly responsible for community-acquired pneumonia in older adults is:

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Streptococcus pneumonia is the most common cause of community-acquired pneumonia in older adults, as well as in children and younger adults. Pseudomonas aeruginosa is more commonly associated with hospital-acquired infections, and Staphylococcus aureus is more commonly associated with skin and soft tissue infections. Proteus mirabilis is not usually a cause of pneumonia.

The Organism Most Commonly Responsible for Community-Acquired Pneumonia in Older