A. Multiple Choice Questions (MCQs) on Infective Endocarditis Question 1: Which of the following is the primary site of infection in infective endocarditis? a) Myocardium b) Pericardium c) Endocardium d) Epicardium Answer: c) Endocardium Explanation: Infective endocarditis involves infection of the endocardium, the inner lining of the heart chambers and valves. Question 2: Which of the following microorganisms is commonly associated with acute, rapidly progressing endocarditis? a) Streptococcus viridans b) Staphylococcus aureus c) Enterococcus faecalis d) Streptococcus bovis Answer: b) Staphylococcus aureus Explanation: Staphylococcus aureus is known for causing acute and aggressive forms of infective endocarditis. Question 3: Which group of microorganisms is often implicated in culture-negative endocarditis cases? a) Streptococcus viridans b) Coagulase-negative Staphylococci c) HACEK group organisms d) Streptococcus pyogenes Answer: c) HACEK group organisms Explanation: HACEK organis...