CD4 and cystic fibrosis: *Includes asthma, chronic obstructive pulmonary disease, or cystic fibrosis.**Includes hypertension, congestive heart failure, or coronary artery disease.***Includes hematologic malignancy, stem cell transplant, solid organ transplant, active/recent cytotoxic chemotherapy, anti-TNFα or other immunosuppressants, >20 mg prednisone equivalent/day, congenital immunodeficiency, hypogammaglobulinemia on Intravenous Immunoglobulin (IVIG), HIV with CD4 < 200.****Includes fever, cough, sore throat, body aches, or diarrhea.