Which one of the following statements is corr | vedclass

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(d) : $AIDS$ (acquired immuno deficiency syndrome) a syndrome, is caused by the retrovirus $HIV$ (human immunodeficiency virus). The virus destroys a

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The causative $HIV$ retrovirus enters helper T&shy;lymphocytes thus reducing their numbers.

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(d) : $AIDS$ (acquired immuno deficiency syndrome) a syndrome, is caused by the retrovirus $HIV$ (human immunodeficiency virus). The virus destroys a subgroup of lymphocytes, the helper $T$ &shy;cells (or $CD4$ lymphocytes), resulting in suppression of the body&rsquo;s immune response. $HIV$ is transmitted in blood, semen and vaginal fluid; the major routes of infection are unprotected vaginal and anal inter-course, intravenous drug abuse, and the administration of contaminated blood and blood products. A combination of antiviral drugs can delay the development of full&shy;blown $AIDS$ for many years but cannot fully care the disease.

Which one of the following statements is correct with respect to $AIDS$ ?

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