Eight months after prosthetic valve replacement, most common organism causing infective endocarditis is:: (A) Staph. epidermidis, (B) Strep. viridans, (C) Staph. aureus, (D) HACEK
Answer is A. Ans. (a) Staph. epidermidis Coagulase negative staphylococci is the most common cause of endocarditis in posthetic value recepients with in one year of surgery.