Beware of Drug Interactions Treating Iatrogenic Mycobacterium bovis Endocarditis from Intravesical BCG Instillation.

We report a case of mechanical mitral valve endocarditis associated with miliary disseminated bacillus Calmette-Guerin (BCG) infection following intravesical instillations for minimally invasive bladder cancer in a 65-year-old man. The diagnosis was established by echocardiographic evidence of vegetation on the prosthetic mitral valve, miliary lesions in the lungs and evidence of bloodstream infection sustained by Mycobacterium. We successfully treated the patient with the classical regimen of quadruple antituberculous therapy. LEARNING POINTS: To consider endocarditis as an extra-pulmonary manifestation of Mycobacterium bovis infection, especially in the presence of predisposing heart conditions and risk factors.To be careful of drug interactions among warfarin, rifampin and amiodarone. © EFIM 2021.