Answer :

HIV attaches to these CD4 cells. The virus then infects the cells and uses them as a place to multiply. In doing so, the virus destroys the ability of the infected cells to do their job in the immune system. The body then loses the ability to fight many infections. HIV is a unique human RNA virus, capable of infecting cells of the immune system. Specifically, HIV targets T helper cells (CD4 cells), leading to the eventual death of the cell. CD4 cells are vital players in the regulation of immune responses to invading microorganisms. In an untreated person, 10 billion to 100 billion new viruses are produced per day. This massive viral replication leads to a progressive loss of CD4 cells over a period of several years to as long as a decade. And destruction of CD4 cells renders a patient vulnerable to unusual opportunistic infections (OIs) that are rarely seen in healthy humans. Most patients who die from AIDS succumb to one or more infections.


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