History of diseases associated with impaired host defenses, such as diabetes mellitus or congestive heart failure. Patients with impaired host defenses also include individuals with either acquired or congenital, quantitative or qualitative defects in neutrophil, lymphocyte, monocyte/macrophage or complement function. Similarly, patients requiring immunosuppressive therapies, such as a chronic corticosteroid utilization for more than 6 months or cytoxic chemotherapeutic agents will be excluded.