The Majority of Cases of Pneumonia are Caused By

Question

The majority of cases of pneumonia are caused by
A) Mycoplasma pneumoniae.
B) Klebsiella pneumoniae.
C) Haemophilus influenzae.
D) Streptococcus pneumoniae.
E) Chlamydophila pneumoniae.

Accepted Answer

Streptococcus pneumoniae is the most common cause of community-acquired pneumonia, accounting for up to 50% of cases. Mycoplasma pneumoniae and Chlamydophila pneumoniae are also common causes, but together they account for a smaller proportion of cases. Haemophilus influenzae and Klebsiella pneumoniae are less common causes of pneumonia.