other conditions

serious opportunistic infections (protozoal, helminthic, fungal, bacterial, viral) and neoplasms such as Kaposi's sarcoma and primary lymphoma of the brain.

HIV infection of lymphocytes and other cells that bear specific protein markers leads to lym-phopenia and impaired T and B cell function. When HIV infection becomes advanced it often is referred to as AIDS, which generally occurs when the CD4 count is below 200/mL. AIDS is characterized by the appearance of opportunistic infections.

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