<prompt> Acute Infective Endocarditis with abscess formation is most common associated with -ListeriaStaphylococcusStreptococcusEnterococcus  <response>: Ans. is b i.e., Staphylococcus o Acute Infective Endocarditis with abscess formation is most commonly associated with staphylococcus. The most common organism causing acute infective endocarditis overall is staphylococcus aureus. Staphyloccoccus aureus endocardiitis is particularly virulent and associated with annular and myocardial abscess formation and a higher mortality!. Abscesses mav also occur with enterococcus but are more common with enterococcus but are more common with staphylococcus. 