Patients with autoimmune thrombocytopenia purpura, autoimmune hemolytic anemia, or pure red cell aplasia are followed on days 7, 14, 21, 28, 60, and 100, 6 months, and 1, 2, and 5 years. Patients with rheumatoid arthritis, juvenile rheumatoid arthritis, or systemic lupus erythematosus are followed on days 14, 28, 60, and 100, and then every 6 months. Patients with vasculitis are monitored for abnormal clinical and laboratory parameters characteristic of the individual type of vasculitis.