A good place to start is the Merck Manual of Diagnosis and Therapy because it provides trusted, concise and correct discussions of diagnosis and therapy. The Merck Manual Online is the best, the first place to go for clinical decision support. It is updated periodically with new information and contains photographs, and audio and video material, quizzes, cases, and more.
To access the Merck Manual
The Manual is organized hierarchically by
Alternatively, if you know your topic you can type the condition in the search box such as infective endocarditis.