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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 ...
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.
Two types of HIV have been characterized: HIV-1 and HIV-2. HIV-1 is the virus that was initially discovered and termed both lymphadenopathy associated virus (LAV) and human T-lymphotropic virus 3 (HTLV-III). HIV-1 is more virulent and more infective than HIV-2, [20] and is the cause of the majority of HIV infections globally. The lower ...
Thus HIV infection can only be diagnosed by PCR testing for HIV RNA or DNA, or via testing for the p24 antigen. [30] Much of the world lacks access to reliable PCR testing, and people in many places simply wait until either symptoms develop or the child is old enough for accurate antibody testing. [ 113 ]
Reference ranges (reference intervals) for blood tests are sets of values used by a health professional to interpret a set of medical test results from blood samples. Reference ranges for blood tests are studied within the field of clinical chemistry (also known as "clinical biochemistry", "chemical pathology" or "pure blood chemistry"), the ...
An uninfected person has 500-1500 CD4 T cells/μL of blood. When this count lowers to less than 500 CD4 T cells/μL, opportunistic infections can occur where the immune system is no longer able to fight pathogens it would have easily cleared in an unimpaired state. The infection progresses to AIDS when the count falls below 200 CD4 T cells/μL ...
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