Learning objectives: a) Know to identify the main signs and symptoms of presentation of native and imported, infectious diseases both in the normal host and guest immunosuppressed, in its different locations. (b) Know recognize and orient the main infectious syndromes organ-specific and systemic, particularly those requiring urgent medical attention; (c) acquire skills and work methods related to the clinical approach and the urgent attention of infections associated with medical and surgical procedures, and in immunocompromised patients