Pathology Which of the following is the most common cause of subacute endocarditis? A Staphylococcus aureus B Staphylococcus epidermidis C Streptococcus viridans D Streptococcus pyogenes 💡 Explanation Which of the following is the most common cause of subacute endocarditis? ✓ Correct Answer: C. Streptococcus viridans