Biology : PU-CET (U.G) 2017 Panjab University Entrance Exam With Answers

HIV (Human Immunodeficiency Virus) attacks T-helper cells, also known as CD4+ T-cells.

These are a type of white blood cell that play a crucial role in the immune response by coordinating and activating other immune cells, including B-cells and cytotoxic T-cells. When HIV infects a T-helper cell, it uses the cell's machinery to replicate itself, eventually causing the cell to die. As HIV destroys more and more T-helper cells, the immune system becomes progressively weaker and less able to fight off infections and cancers, leading to the development of acquired immunodeficiency syndrome (AIDS).