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The Human Immunodeficiency Virus (HIV) is a single-stranded RNA virus which reproduces in human CD4-positive cells, which are primarily T-helper lymphocytes and macrophages. HIV is the causative pathogen of Acquired Immunodeficiency Syndrome (AIDS).

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Why can't we always create a vaccine against a virus when an ELISA test to detect it is poss...

One of the reasons there are still no vaccine against HIV is because this virus has a very high mutation rate. The ELISA test is used to detect the presence of HIV. … But if the HIV has a high mutation rate, how can we be able to produce an ELISA test for it? …
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