Which of the following is a type of community-acquired pneumonia?

• A. Atypical pneumonia caused by organisms such as Mycoplasma pneumoniae, Chlamydia pneumoniae, and Legionella
• B. Typical pneumonia caused by Streptococcus pneumoniae with lobar consolidation
• C. Viral pneumonia exclusively
• D. Fungal pneumonia in healthy individuals

Answer: (A)

In community-acquired pneumonia, pathogens are often described as typical or atypical. The atypical group includes Mycoplasma pneumoniae, Chlamydia pneumoniae, and Legionella. These organisms are classic causes of atypical CAP and tend to produce a different clinical and radiographic picture—nonspecific symptoms, a more gradual onset, and interstitial or patchy infiltrates rather than dense lobar consolidation.

That makes this option the best answer because it highlights the recognized atypical type within community-acquired pneumonia. The other choices describe patterns or scenarios that can occur with CAP or respiratory infection in general, but they don’t capture this commonly taught category of atypical pneumonia.