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.

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• HIV Infections
• Slow Virus Diseases

• List of 21 Immunologic Deficiency Syndromes Lentivirus Infections Sexually Transmitted Diseases, Viral Virus Diseases AIDS Arteritis, Central Nervous System AIDS Dementia Complex AIDS-Associated Nephropathy AIDS-Related Complex AIDS-Related Opportunistic Infections Aleutian Mink Disease Equine Infectious Anemia Feline Acquired Immunodeficiency Syndrome HIV Enteropathy HIV Seropositivity HIV Wasting Syndrome HIV-Associated Lipodystrophy Syndrome Leukoencephalopathy, Progressive Multifocal Pneumonia, Progressive Interstitial, of Sheep Simian Acquired Immunodeficiency Syndrome Subacute Sclerosing Panencephalitis Visna
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