“…Certain of these may occur throughout the patient's course and are possibly related to deficient mechanisms of delayed hypersensitivity (3)(4)(5)(6). However, the majority of infectious episodes occur late in the course of the illness (2), when other factors, such as the extensive use of immunosuppressive agents, especially corticosteroids (2), lymphocytopenia (7), and alterations in circulating antibody (8)(9)(10), may be implicated.…”