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A woman demonstrates the use of the OraQuick rapid HIV test. Blood being taken for HIV rapid test. Rapid antibody tests are qualitative immunoassays intended for use in point-of-care testing to aid in the diagnosis of HIV infection. These tests should be used in conjunction with the clinical status, history, and risk factors of the person being ...
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 ...
HIV/AIDS explained in a simple way HIV replication cycle After the virus enters the body, there is a period of rapid viral replication , leading to an abundance of virus in the peripheral blood. During primary infection, the level of HIV may reach several million virus particles per milliliter of blood. [ 101 ]
One reason for abnormal results is the loss of CD4-positive cells to the human immunodeficiency virus (HIV) infection. The loss of CD4-positive cells to HIV infection can result in various distortions in the ratio, as in the initial period, production of HIV specific CD8 positive cells will cause a large fall in the ratio, but subsequent ...
At this stage, viral loads reach high levels and the number of CD4 helper T cells in the blood begins to drop. At this point, seroconversion, the development of antibodies, occurs and the CD4 T cell counts begin to recover as the immune system attempts to fight the virus, marking the HIV set point.
HIV differs from many viruses in that it has very high genetic variability. This diversity is a result of its fast replication cycle, with the generation of about 10 10 virions every day, coupled with a high mutation rate of approximately 3 x 10 −5 per nucleotide base per cycle of replication and recombinogenic properties of reverse ...
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