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Considerable variation exists in the relative risk of death following different AIDS defining clinical conditions. According to the US CDC definition, one has AIDS if he/she is infected with HIV and present with one of the following: A CD4+ T-cell count below 200 cells/μl (or a CD4+ T-cell percentage of total lymphocytes of less than 14%) OR
Globally, some 35.3 million are living with HIV/AIDS, World Health Organization (WHO), an estimated 36 million people have died since the first cases were reported in 1981 and 1.6 million people died of HIV/AIDS in 2012. [1]
In 1993, the CDC added pulmonary tuberculosis, recurrent pneumonia and invasive cervical cancer [2] to the list of clinical conditions in the AIDS surveillance case definition published in 1987 [3] and expanded the AIDS surveillance case definition to include all HIV-infected persons with CD4+ T-lymphocyte counts of fewer than 200 cells/μL or ...
The CD4 T-cell count is not an HIV test, but rather a procedure where the number of CD4 T-cells in the blood is determined. A CD4 count does not check for the presence of HIV. It is used to monitor immune system function in HIV-positive people. Declining CD4 T-cell counts are considered to be a marker of progression of HIV infection.
Viral load testing provides more information about the efficacy for therapy than CD4 counts. [22] For the first 2 years of HIV therapy, CD4 counts may be done every 3–6 months. [22] If a patient's viral load becomes undetectable after 2 years then CD4 counts might not be needed if they are consistently above 500/mm 3. [22]
A CD4 count of less than 200/μL [30] The U.S. Centers for Disease Control and Prevention also created a classification system for HIV, and updated it in 2008 and 2014. [115] [116] This system classifies HIV infections based on CD4 count and clinical symptoms, and describes the infection in five groups. [116]
CD4 counts should rise 50 to 100 cells per ml in the first year of therapy. [56] There can be substantial fluctuation in CD4 counts of up to 25% based on the time of day or concomitant infections. [95] In one long-term study, the majority of increase in CD4 cell counts was in the first two years after starting ART with little increase afterwards.
(This is the interim African Region version for persons aged 15 years or more who have had a positive HIV antibody test or other laboratory evidence of HIV infection) (The United Nations defines adolescents as persons aged 10−19 years but for surveillance purposes, the category of adults and adolescents comprises people aged 15 years and over)
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