Book excerpt: This reference resource represents the consensus opinion a team of international specialists on the diagnosis and treatment of infective endocarditis (IE), many of whom have been co-authors of American or European guidelines on the topic. It is therefore a useful tool for many practitioners: cardiologists and cardiac imagers, cardiac surgeons, echocardiographers, specialists of internal medicine, neurologists, and infectiologists. ​​​Infective endocarditis (IE) is defined as an infection of the endocardial surface of the heart, which may include one or more heart valves, the mural endocardium, or a septal defect. Its intracardiac effects include severe valvular insufficiency, which may lead to intractable congestive heart failure and myocardial abscesses. If left untreated, IE is generally fatal. IE is a changing disease with new diagnostic techniques, new therapeutic strategies, more frequent elderly people and patients with prosthetic valves of intravenous drug users.