“The human immunodeficiency virus (HIV) targets cells of the immune system, called CD4 cells, which help the body respond to infection. Within the CD4 cell the HIV replicates and in turn damages and destroys the cel.l Without effective treatment, using a combination of antiretroviral drugs, the immune system will become weakened to the point that it can no longer fight infection and disease.”
Source: WHO. 2017. "What is HIV?". World Health Organization Website. <https://www.who.int/news-room/q-a-detail/hiv-aids>. Accessed 12 June 2020.