Final answer:
Infective endocarditis in IV drug users is associated with a regurgitant murmur.
Step-by-step explanation:
Infective endocarditis is an infection of the heart's inner lining as well as the valves. It can be caused by various bacteria including Staphylococcus aureus, viridans streptococci, and Enterococcus faecalis. When infective endocarditis occurs in intravenous (IV) drug users, it is often associated with a specific heart murmur called a regurgitant murmur.