A 28-year-old man with fever persisting for 3 weeks presented with tricuspid valve vegetation. The patient is an intravenous drug abuser. The most common cause of endocarditis in this patient is
Correct Answer: Staphylococcus aureus
Description: Staphylococcus aureus is the most common cause of infective endocarditis among injection drug users. Microbiology of Infective Endocarditis Community-acquired Native valve endocarditis- Viridans group streptococci (VGS) Healthcare-associated Native valve endocarditis -Staphylococcus aureus Endocarditis in injection drug users- Staphylococcus aureus Early prosthetic valve endocarditis (<12 months after surgery)- Single most common causative organism: Viridans Streptococci and Overall most common cause: Coagulase-negative staphylococci (CoNS)* Late prosthetic valve endocarditis (>12 months after surgery)- Single most common causative organism: Viridans Streptococci and Overall most common cause: Coagulase-negative staphylococci (CoNS)* Cardiovascular implantable electronic device (CIED)- associated endocarditis- Staphylococcus aureus and coagulase-negative Staphylococci (CoNS)* *CoNS includes Staphylococcus epidermidis and other coagulase-negative types *Streptococci includes Viridans streptococci (VGS), Streptococcus gallolyticus (previously Streptococcus bovis biotype 1) and other nongroupable and groupable streptococci Reference: Ananthanarayan and Paniker&;s Textbook of Microbiology Tenth edition
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