This document discusses infective endocarditis, including its classification, pathogenesis, risk factors, signs, diagnosis, and complications. It can be classified as native or prosthetic valve endocarditis. Pathogenesis involves bacterial seeding of the heart valves leading to vegetation formation. Common risk factors include intravenous drug use and artificial heart valves. Signs may be nonspecific like fever or more specific like Osler's nodes. Diagnosis involves blood cultures and echocardiography. Complications affect the heart, kidneys, brain, spleen and other organs due to embolisms.