At which stage of HIV infection does one usually show symptoms of AIDS?

At which stage of HIV infection does one usually show symptoms of AIDS?
  1. Within 15 days of sexual contact with an infected person.
  2. When the infected retro virus enters host cells.
  3. When HIV damages large number of helper T-Lymphocytes.
  4. When the viral DNA is produced by reverse transcriptase.

Solution

HIV selectively destroys helper T-lymphocytes. It, therefore, causes symptoms of immunodeficiency due to a critically low number of helper T-lymphocytes. The TH cells are attacked by HIV and stop the triggering of B-lymphocytes by the T-cells, and thereby the immunodeficiency will be observed in the absence of antibodies.

Asked in: NEET 2014

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