Pediatric Infectious Diseases Fellowship Welcome from the Program Director Mary T. Caserta, M.D., Director Fellowship Training Program The main focus of the Infectious Diseases Fellowship Program is to provide research training for pediatric clinician-investigators in the area of opportunistic infections (OIs) and other infections in the immunocompromised host. Other areas of training are possible, and we encourage interested individuals to contact us. The need for such a training program is based on the following premises: Premise 1: There is a large number of pediatric patients who are immunocompromised and at risk for OIs and other infections. Premise 2: Because of developmental, physiologic, and disease-specific differences between children and adults, researchers with specific pediatric expertise should be involved in basic investigations related to OIs and infection in the immunocompromised child. Premise 3: There is a lack of pediatric physician-scientist involvement in the study of OIs and other infections in the immunocompromised host. Premise 4: Training pediatric physician-scientists who can contribute substantive research in this field requires a rigorous laboratory-based training program.