Acquired Immunodeficiency Syndrome [Disease/Finding] An acquired defect of cellular immunity associated with infection by the human immunodeficiency virus (HIV), a CD4-positive T-lymphocyte count under 200 cells/microliter or less than 14% of total lymphocytes, and increased susceptibility to opportunistic infections and malignant neoplasms. Clinical manifestations also include emaciation (wasting) and dementia. These elements reflect criteria for AIDS as defined by the CDC in 1993. Immunologic Deficiency Syndrome, Acquired Acquired Immune Deficiency Syndrome Acquired Immunodeficiency Syndrome Immunodeficiency Syndrome, Acquired Acquired Immunodeficiency Syndrome AIDS Acquired Immuno-Deficiency Syndrome 1022762 N0000000291 62479008 C0001175 D000163 C760 M0000245 Slow Virus Diseases [Disease/Finding] HIV Infections [Disease/Finding]