The most common etiologic organism for community-acquired pneumonia is:
A. Streptococcus pneumoniae
B. Beta hemolytic streptococcus
C. Mycoplasma
D. Methicillin resistant staphylococcus
ANS: A
Pneumonia involves inflammation and consolidation of lung tissue. Pneumonia is broadly categorized by whether it occurs outside of the hospital (community-acquired pneumonia) or within the hospital (nosocomial, or hospital-acquired, pneumonia). The cause is most often Streptococcus pneumoniae, Haemophilus influenzae, or Staphylococcus aureus. Atypical pneumonia involves infection of mycoplasma, legionella, or chlamydia.
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