HIV (human immunodeficiency virus) is a virus that attacks the immune system, making it difficult for the body to fight off infection and some diseases. HIV eventually causes AIDS (acquired immunodeficiency syndrome).

Initial HIV symptoms are similar to those of the flu and include fatigue, fever, weight loss, and swollen lymph nodes in the neck, armpits, or groin. Although there currently is no cure for HIV infection, a combination of medications called highly active antiretroviral therapy, or HAART, helps prolong life in many people. A person with HIV infection may live for many years before developing any signs of AIDS.