Which of the following is the most common cause of community-acquired pneumonia in young adults

Which of the following is the most common cause of community-acquired pneumonia in young adults

Which of the following is the most common cause of community-acquired pneumonia in young adults?

A. Streptococcus pneumoniae

B. Mycoplasma pneumoniae

C. Legionella pneumophila

D. Haemophilus influenzae

Answer: B

Explanation: Mycoplasma pneumoniae is the leading cause of community-acquired pneumonia in young, healthy adults; Streptococcus pneumoniae is more common in elderly and immunocompromised patients.