Pathology Community acquired pneumonia is most commonly caused by: September 2005 and March 2008 A Staphylococcus aureus B Streptococcus pneumoniae C H.influenza D Klebsiella 💡 Explanation Community acquired pneumonia is most commonly caused by: September 2005 and March 2008 ✓ Correct Answer: B. Streptococcus pneumoniae