Quick Answer

HIV originated in chimpanzees in Central Africa, not monkeys. The simian immunodeficiency virus (SIV) in chimpanzees likely crossed to humans when hunters handled infected chimp meat. This is distinct from SIV in monkeys, which does not typically infect humans.

  • HIV is a retrovirus that gradually weakens the immune system.
  • AIDS is the advanced stage of HIV infection when CD4 count falls very low.
  • With modern antiretroviral therapy, HIV can become undetectable in the blood.
  • Undetectable means the virus cannot be transmitted to others (U=U).
  • HIV treatment usually involves a combination of drugs like tenofovir and emtricitabine.
  • Without treatment, HIV may progress to AIDS over several years.

Context Most Pages Skip

Human immunodeficiency virus (HIV) is a retrovirus that attacks the immune system. Untreated, it can lead to acquired immunodeficiency syndrome (AIDS). Understanding how HIV began helps clarify what it is and is not. The virus is similar to a chimpanzee virus, not a monkey virus. Modern treatment can make the virus undetectable in the blood, which stops transmission and protects health. This guide explains the origin, how HIV differs from AIDS, and what undetectable means.

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⚕️ This page is educational and does not replace advice from a licensed clinician. If you may have been exposed to an STI, get tested — most infections are manageable, and many are fully curable.

Sources & Further Reading

Figures reflect CDC surveillance and WHO estimates; they are population statistics, not personal risk predictions.