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  1. What Are HIV and AIDS? - HIV.gov

    Nov 12, 2025 · HIV (human immunodeficiency virus) is a virus that attacks cells that help the body fight infection, making a person more vulnerable to other infections and diseases.

  2. HIV - Wikipedia

    HIV-1 is the virus that was initially discovered and termed both lymphadenopathy associated virus (LAV) and human T-lymphotropic virus 3 (HTLV-III). HIV-1 is more virulent and more infective than HIV-2, …

  3. HIV and AIDS - World Health Organization (WHO)

    Jul 15, 2025 · Human immunodeficiency virus (HIV) is a virus that attacks the body’s immune system. Acquired immunodeficiency syndrome (AIDS) occurs at the most advanced stage of infection.

  4. About HIV | HIV | CDC

    Jan 14, 2025 · HIV (human immunodeficiency virus) is a virus that attacks the body's immune system. Without treatment, it can lead to AIDS (acquired immunodeficiency syndrome). There is currently no …

  5. HIV/AIDS: Facts, Statistics, Symptoms, Causes, Diagnosis, and

    Oct 6, 2025 · Discover how HIV spreads, how to prevent the virus progressing to AIDS, and where to get treatment.

  6. HIV/AIDS - Symptoms and causes - Mayo Clinic

    Feb 9, 2024 · It's caused by the human immunodeficiency virus, also called HIV. HIV damages the immune system so that the body is less able to fight infection and disease. If HIV isn't treated, it can …

  7. HIV and AIDS: The Basics | NIH - HIVinfo

    May 28, 2025 · The human immunodeficiency virus (HIV) is the virus that causes HIV infection. If untreated, HIV may progress to AIDS, the most advanced stage of HIV infection.

  8. Understanding HIV: What You Need to Know - aids.org

    HIV stands for Human Immunodeficiency Virus. It attacks the immune system, specifically the CD4 cells (T cells), which help the body fight off infections. If left untreated, HIV can lead to AIDS (Acquired …

  9. HIV and AIDS - Basic facts | UNAIDS

    HIV stands for human immunodeficiency virus. HIV is a retrovirus that infects cells of the human immune system (mainly CD4-positive T-cells and macrophages—key components of the cellular immune …

  10. What is HIV/AIDS? - World HIV Day

    HIV stands for Human Immunodeficiency Virus. It’s a retrovirus, meaning it uses RNA (ribonucleic acid) as its genetic material instead of DNA (deoxyribonucleic acid) like most organisms. HIV specifically …