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The results of a viral load test help determine when a CD4 count is indicated. [1] CD4 cells are the primary target of HIV. A CD4 test quantifies Helper T cells and is often combined with viral load testing to monitor the progression of HIV. CD4 testing shows the strength of the immune system, but does not report viral activity.
Currently, routine testing is available for HIV-1, cytomegalovirus, hepatitis B virus, and hepatitis C virus. Viral load monitoring for HIV is of particular interest in the treatment of people with HIV, as this is continually discussed in the context of management of HIV/AIDS. An undetectable viral load does not implicate a lack of infection.
Suppressing the viral load to undetectable levels (<50 copies per ml) is the primary goal of ART. [56] This should happen by 24 weeks after starting combination therapy. [83] Viral load monitoring is the most important predictor of response to treatment with ART. [84] Lack of viral load suppression on ART is termed virologic failure.
Virological failure is defined as the failure to meet a specific target of antiviral drug treatment, namely the non-attainment or non-maintenance of undetectable viral load, particularly in the treatment of HIV. As antiretroviral therapy is evaluated by detecting the amount of copies of the virus in blood samples, the concept of virological ...
The campaign seeks to spread the scientific evidence that undetectable means untransmittable. Since the beginning of the epidemic, perceptions and management of HIV infection have gone through many stages; from assuming the infectiousness, then discovering the routes of transmission (blood, sexual fluids, and breastfeeding), to prevention methods (education, condoms, PrEP, and PEP) and various ...
Long-term nonprogressors typically have viral loads under 10,000 copies /mL blood, [3] do not take antiretrovirals, and have CD4+ counts within the normal range. [4] Most people with HIV not on medication have viral loads which are much higher. It is estimated that around 1 in 500 people with HIV are long-term nonprogressors. [5]
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