<prompt> Most common infection in patients with prosthetic valves within one month of Surgery:PneumococcusPseudomonasStaphylococcus aureusEnterococci  <response>: Ans. C. Staphylococcus aureusStaphylococci and streptococci can account for majority of Infective endocarditis. Staphylococcal infective endocarditis is more common in healthcare associated infective endocarditis cases and it accounts for more than half of infective endocarditis cases. Streptococci remains common cause of community acquired infective endocarditis. Injection drug use endocarditis is more common in young males and it affects the right side of the heart. The tricuspid valve is involved more commonly than the pulmonary valve. 