Human Immunodeficiency Virus
HIV can be caused by blood transfusions, sharing needles, having sex, or during pregnancy. This virus cannot be transmitted through ordinary contact such as hugging or shaking hands with someone who has the virus. It also cannot be transmitted through the air, water, or insect bites.Once the HIV virus is inside of you it destroys your CD4 cell, these are a type of white blood cell that help your body fight disease, as more of these cells are killed your immune system weakens. We your CD4 cell count drops below about 200 your HIV will progress to AIDS or you will experience an AIDS-Defining Illness.
Immune cells involved in immune response
Once the T- cells are infected they start creating new viruses instead doing the job it is supposed to do in your immune system. In addition, many T- cells are destroyed in the process. The T cells are killer cells that recognize non-self cells and fight them off. When the HIV virus attacks these cells and they can not perform their jobs. Which leads to aids.