**Core Concept**
Infective endocarditis in IV drug abusers is a type of infective endocarditis that occurs due to the introduction of bacteria into the bloodstream through non-sterile needles or contaminated IV equipment. This condition often affects the tricuspid valve, which is the valve between the right atrium and right ventricle.

**Why the Correct Answer is Right**
The tricuspid valve is more commonly affected in IV drug abusers due to the direct introduction of bacteria into the right heart. This is because the tricuspid valve is exposed to the venous bloodstream, which carries bacteria from the skin and other potential sources of infection. The bacteria most commonly involved in infective endocarditis in IV drug abusers include Staphylococcus aureus and Streptococcus species.

**Why Each Wrong Option is Incorrect**
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**Clinical Pearl / High-Yield Fact**
Infective endocarditis in IV drug abusers often presents with symptoms such as fever, heart murmur, and signs of right-sided heart failure. It is essential to consider this condition in the differential diagnosis of patients with these symptoms, especially if they have a history of IV drug use.

**Correct Answer:**
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