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Nucleic-acid-based tests amplify and detect one or more of several target sequences located in specific HIV genes, such as HIV-I GAG, HIV-II GAG, HIV-env, or the HIV-pol. [32] [33] Since these tests are relatively expensive, the blood is screened by first pooling some 8–24 samples and testing these together; if the pool tests positive, each ...
Lateral flow test is one of the blood testing methods used, in which a blood sample or oral fluid is placed on a strip of paper. In this method, a colored band indicates infection. [citation needed] People in lesser developed regions like the Sub-Saharan Africa are adversely affected by HIV/AIDS and have very limited access to clinical labs or ...
A wide variety of samples can be used for virological testing. The type of sample sent to the laboratory often depends on the type of viral infection being diagnosed and the test required. Proper sampling technique is essential to avoid potential pre-analytical errors.
The latest recommendations of the US Centers for Disease Control and Prevention (CDC) show that HIV testing must start with an immunoassay combination test for HIV-1 and HIV-2 antibodies and p24 antigen. A negative result rules out HIV exposure, while a positive one must be followed by an HIV-1/2 antibody differentiation immunoassay to detect ...
On November 7, 2002, the FDA approved the OraQuick test as the first rapid HIV test, providing results in as little as 20 minutes using whole-blood specimens obtained from a fingerstick or venipuncture. Prior to this approval, HIV tests required blood samples to be sent to a laboratory, resulting in longer wait times for results.
In June 1987, Witte tested the tissue samples again using Western blot, the most sensitive test then available. The Western blot test found that antibodies against all nine detectable HIV proteins were present in Rayford's blood. An antigen capture assay identified HIV antigens in tissue samples, but not in serum. [3]