HIV is a virus that attacks the immune system, which is our body’s natural defence against illness. The virus destroys a type of white blood cell in the immune system called a T-helper cell, and makes copies of itself inside these cells. T-helper cells are also referred to as CD4 cells. As HIV destroys more CD4 cells and makes more copies of itself, it gradually breaks down a person’s immune system. This means someone living with HIV, who is not receiving treatment, will find it harder and harder to fight off infections and diseases. If HIV is left untreated, it may take up to 10 or 15 years for the immune system to be so severely damaged it can no longer defend itself at all. However, the speed HIV progresses will vary depending on age, health and background.
Contact With Certain Body Fluids.These body fluids include:
The use of HIV medicines to treat HIV infection is called antiretroviral therapy (ART). ART involves taking a combination of HIV medicines (called an HIV regimen) every day. (HIV medicines are often called antiretrovirals or ARVs.)
Soon after infection with HIV, some people have flu-like symptoms, such as fever, headache, or rash. The symptoms may come and go for a month or two after infection. After this earliest stage of HIV infection, HIV continues to multiply but at very low levels. More severe symptoms of HIV infection, such as chronic diarrhea, rapid weight loss, and signs of opportunistic infections, generally don’t appear for many years. Without treatment, HIV can advance to AIDS. HIV transmission is possible at any stage of HIV infection—even if an HIV-infected person has no symptoms of HIV.