Which of the following pathogens is the most common cause of community-acquired pneumonia (CAP) in adults in Japan
Which of the following pathogens is the most common cause of community-acquired pneumonia (CAP) in adults in Japan?
A. Staphylococcus aureus
B. Streptococcus pneumoniae
C. Haemophilus influenzae
D. Mycoplasma pneumoniae
Answer: B
Explanation: According to the Japanese Guidelines for the Management of Community-Acquired Pneumonia, Streptococcus pneumoniae is the leading pathogen of CAP in adults, accounting for approximately 30%-50% of cases. Haemophilus influenzae and Mycoplasma pneumoniae are common but less frequent than S. pneumoniae (C, D are incorrect). Staphylococcus aureus is more common in hospital-acquired pneumonia (A is incorrect).
