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The very high negative predictive value of these tests is why the CDC recommends that a negative test result be considered conclusive evidence that an individual does not have HIV. [citation needed] Of course, the actual numbers vary depending on the testing population.
WHO Disease Staging System for HIV Infection and Disease in Adults and Adolescents was first produced in 1990 by the World Health Organization [1] and updated in September 2005. It is an approach for use in resource limited settings and is widely used in Africa and Asia and has been a useful research tool in studies of progression to ...
An HIV antibody test usually detects the HIV antibodies within two to eight weeks, but can have a valid negative result for a long as 2 to 6 months after initial infection. Viral load tests can also be used to diagnose HIV infection, especially in children under 18 months born to mothers with HIV, where the presence of maternal antibodies ...
The CDC Classification System for HIV Infection is the medical classification system used by the United States Centers for Disease Control and Prevention (CDC) to classify HIV disease and infection. [1] The system is used to allow the government to handle epidemic statistics and define who receives US government assistance.
Long-term nonprogressors (LTNPs), are individuals infected with HIV, who maintain a CD4 count greater than 500 without antiretroviral therapy with a detectable viral load. [1] Many of these patients have been HIV positive for 30 years without progressing to the point of needing to take medication in order not to develop AIDS.
A negative result rules out HIV exposure, while a positive one must be followed by an HIV-1/2 antibody differentiation immunoassay to detect which antibodies are present. This gives rise to four possible scenarios: 1. HIV-1 (+) & HIV-2 (−): HIV-1 antibodies detected; 2. HIV-1 (−) & HIV-2 (+): HIV-2 antibodies detected; 3.
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