Quick Answer
The first human likely acquired HIV from a chimpanzee in Central Africa around the early 1900s, when a hunter was exposed to infected blood during butchering. The virus, a retrovirus, later evolved into HIV-1 group M, which causes most global infections. HIV is the virus; AIDS is the advanced stage of untreated infection.
- HIV originated from simian immunodeficiency virus (SIV) in chimpanzees.
- Transmission to humans likely occurred through blood contact during hunting.
- The earliest confirmed HIV case is from a 1959 blood sample in Kinshasa.
- HIV is a retrovirus that attacks CD4 immune cells.
- AIDS is diagnosed when CD4 count drops below 200 or specific infections occur.
- Modern antiretroviral therapy can achieve undetectable viral load (U=U).
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Understanding how the first human got HIV requires looking at the virus's journey from animals to people. HIV is a retrovirus, meaning it inserts its genetic material into human DNA. It does not cause AIDS immediately; AIDS is the final stage of untreated HIV infection. The distinction matters because today, with proper treatment, HIV can be managed so effectively that the virus becomes undetectable and cannot be transmitted (U=U). This guide explains the origins, the difference between HIV and AIDS, and why cats cannot get HIV from human blood.
Related Questions
Sources & Further Reading
- CDC — Sexually Transmitted Infections
- CDC STI Treatment Guidelines
- WHO — Sexually transmitted infections fact sheet
- MedlinePlus — Sexually Transmitted Diseases
Figures reflect CDC surveillance and WHO estimates; they are population statistics, not personal risk predictions.