At which stage of HIV infection does one usually show symptoms of AIDS? (AIPMT 2014)
A
When HIV damages a large number of helper T - lymphocytes.
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B
When the infected retrovirus enters host cells.
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C
When the viral DNA is produced by reverse transcriptase.
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D
Within 15 days of sexual contact with an infected person.
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Solution
The correct option is A When HIV damages a large number of helper T - lymphocytes. AIDS is a disorder of the cell-mediated immune system of the body. Virus responsible for AIDS is HIV (Human Immunodeficiency Virus). There is a reduction in the number of helper T-cells which stimulate antibody production by B-cells. This results in the loss of natural defence against viral infection.