39.At which stage of HIV infection does one usually show symptoms of AIDS:- A. Within 15 days of sexual contact with an infected person B. When the infected retro virus enters host cells C. When HIV damages large number of helper T-lymphocytes D. When the viral DNA is produced by reverse transcriptase
Option C. In many patients, symptoms of HIV infection do not occur until stage 3 of the infection. HIV selectively destroys helper T-lymphocytes. It, therefore, causes symptoms of immunodeficiency due to a critically low number of helper T-lymphocytes. Stage 3 is usually a period where the severity and frequency of these infections and neoplasms are directly related to the decline of CD4+ T cells or helper T-lymphocytes.
