Microbiology Most common cause of acute bacterial endocarditis is:September 2009 A Staphylococcus aureus B Streptococcus viridans C Streptococcus intermedius D Candida albicans 💡 Explanation Most common cause of acute bacterial endocarditis is:September 2009 ✓ Correct Answer: A. Staphylococcus aureus