Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 exam•Written by the Fiveable Content Team • Last updated September 2025
Definition
HIV (Human Immunodeficiency Virus) is a virus that attacks cells in the immune system, weakening its ability to fight off infections and diseases. If left untreated, HIV can progress to AIDS (Acquired Immunodeficiency Syndrome).
Related terms
Antiretroviral Therapy (ART): A combination of medications used to suppress the replication of HIV and slow down the progression of the disease.
CD4 Cells: White blood cells that are targeted and destroyed by HIV, leading to immune system impairment.
Opportunistic Infections: Infections caused by organisms that take advantage of a weakened immune system, often seen in individuals with advanced HIV/AIDS.