What is the mechanism by which the AIDS virus causes deficiency of immune system of the infected person?
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HIV attacks the helper-T cells inside the host cell, viral RNA syntheses single-stranded DNA on it in the presence of enzyme reverse transcriptase. Single-stranded DNA separates from viral RNA and forms its complimentary copy to form double-stranded DNA which is incorporated into hosts cell DNA.
The viral DNA transcribes large number of RNA particles, each of which gets surrounded by a proteinous capsid to complete viral particles.
Finally, the host helper T- cell is lysed and many HIV viruses are released. Each of these infects new Helper T-cells. So there is progressive decrease in the number of Helper-T- cells.
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