Acute Infective Endocarditis with abscess formation is most commonly associated with
**Core Concept**
Infective endocarditis (IE) is a life-threatening condition characterized by microbial colonization of the heart valves, leading to inflammation and potential abscess formation. The pathogenesis of IE involves the interaction between the microbial pathogen and the host's immune response, which can result in valve damage and abscess formation.
**Why the Correct Answer is Right**
Staphylococcus aureus is the most common cause of acute infective endocarditis with abscess formation. This bacterium can adhere to the heart valve through its adhesin proteins, leading to the activation of the host's immune response and the formation of abscesses. The virulence factors of S. aureus, such as protein A and coagulase, contribute to its ability to colonize and damage the heart valve.
**Why Each Wrong Option is Incorrect**
**Option A:** While Streptococcus viridans is a common cause of subacute IE, it is less commonly associated with abscess formation compared to S. aureus.
**Option B:** Enterococcus faecalis can cause IE, but it is more commonly associated with hospital-acquired infections and is less likely to cause abscess formation.
**Option C:** Coagulase-negative staphylococci, such as Staphylococcus epidermidis, are common skin flora and can cause IE, but they are less commonly associated with abscess formation compared to S. aureus.
**Clinical Pearl / High-Yield Fact**
Staphylococcus aureus is a virulent bacterium that can cause rapidly progressive IE with abscess formation, often requiring urgent surgical intervention. This is in contrast to other causes of IE, which may have a more indolent course.
**Correct Answer:** C.