There are two main types of human immunodeficiency virus (HIV) -- HIV-1 and HIV-2. Both can lead to AIDS. However, they're very different from each other. HIV-1 is the most common type.

Discover what non-reactive HIV test results really mean and why testing timing, window periods, and retesting are crucial for ...

HIV and AIDS are related, in that AIDS is the most advanced stage of an HIV infection, and therefore, the HIV virus causes both conditions. AIDS can also be called a "stage 3 HIV infection." ...

HIV, the human immunodeficiency virus, ... There have been four independent transmission events from apes to humans, which have resulted in four different types of HIV, called strains.

Medically reviewed by Renita White, MD Mouth and tongue lesions are often one of the first symptoms of human immunodeficiency ...

HIV is a virus that attacks the body’s immune system, specifically white blood cells called CD4 T cells, which help the body fight infections. They are also called T4 cells, or “helper T cells.” ...

Secondly, immune cells that are, themselves, prone to HIV infection – such as activated T-cells and dendritic cells – are prone to be present in greater numbers at the site of an infection. "Being the ...

An HIV rash is an early symptom of human immunodeficiency virus (HIV), or an infection that weakens the body's immune system. An HIV rash can be itchy or painful. It generally appears red in ...