AIDS was first recognized in 1981, when doctors in Los Angeles reported a cluster of unusual infections in five young men whose immune systems had mysteriously failed. The virus that causes it, now called HIV, was identified two years later in 1983. But the full story of how AIDS went from a handful of puzzling cases to a global pandemic spans several key years in the early 1980s.
The First Cases: 1981
On June 5, 1981, the CDC published a brief report in its weekly bulletin describing five young men in Los Angeles who had been treated for a rare lung infection called Pneumocystis pneumonia between October 1980 and May 1981. All five were previously healthy, and all had severe immune system failure that doctors couldn’t explain. Along with the pneumonia, they had fungal infections of the mouth and throat, fevers, and signs of other opportunistic infections that normally only strike people with compromised immunity.
Two of the five had already died by the time the report was published. Within weeks, similar clusters of unusual infections and rare cancers began appearing in New York, San Francisco, and other cities. Something was clearly destroying these patients’ immune defenses, but no one yet knew what.
How AIDS Got Its Name: 1982
For more than a year, the new syndrome had no official name. Some in the press called it GRID (gay-related immune deficiency), since the earliest identified cases were among gay men. That label was inaccurate and stigmatizing, especially as cases soon appeared in people who injected drugs, recipients of blood transfusions, and infants born to affected mothers.
On September 24, 1982, the CDC used the term “AIDS” (Acquired Immune Deficiency Syndrome) for the first time and published a formal case definition: a disease that signals a serious defect in the immune system, occurring in a person with no other known reason for weakened immunity.
Finding the Virus: 1983 to 1984
Identifying the disease was one thing. Finding its cause was another. In early 1983, a team at the Pasteur Institute in Paris, led by virologist Luc Montagnier, isolated a new virus from the lymph node of a patient with swollen glands. They detected it in about two weeks and named it LAV (Lymphadenopathy-Associated Virus). Their findings were published in the journal Science on May 20, 1983.
In the United States, Robert Gallo’s team at the National Institutes of Health was working on the same problem. By 1984, Gallo’s group had independently demonstrated that a retrovirus they called HTLV-III was the cause of AIDS. The two viruses turned out to be the same pathogen. In 1986, the international scientific community settled on a single name: human immunodeficiency virus, or HIV.
A second type, HIV-2, was first described in 1985 in West African patients and confirmed in people with AIDS in 1986. HIV-2 is less transmissible and largely concentrated in West Africa, while HIV-1 is responsible for the vast majority of infections worldwide.
The Virus Was Older Than Anyone Realized
Although AIDS wasn’t recognized until 1981, the virus had been quietly circulating for decades. The earliest confirmed trace of HIV comes from a blood sample collected in 1959 in Leopoldville (now Kinshasa) in what is today the Democratic Republic of the Congo. An American researcher studying malaria had frozen 672 blood specimens from across equatorial Africa. When HIV testing became available in the mid-1980s, those samples were checked. Only one tested positive, from an unnamed man in Leopoldville. Genetic analyses suggest the virus likely jumped from chimpanzees to humans in central Africa sometime in the early 1900s, circulating at low levels long before it exploded into a recognized epidemic.
From Discovery to First Treatment
The years between recognizing AIDS and having any way to treat it were devastating. For the first six years, doctors could only manage the opportunistic infections that resulted from immune failure, not the underlying virus. In March 1987, the FDA approved AZT (zidovudine) as the first antiretroviral drug for AIDS. It was far from a cure, and its side effects were severe, but it marked the beginning of antiviral treatment. The real turning point came in the mid-1990s with combination therapy, which used multiple drugs together to suppress the virus far more effectively.
Where Things Stand Now
As of 2024, roughly 40.8 million people worldwide are living with HIV. Around 630,000 people died from AIDS-related illnesses that year. Those numbers, while still staggering, represent enormous progress. At the epidemic’s peak in the mid-2000s, annual deaths were more than three times higher. Modern antiretroviral therapy allows most people with HIV to live near-normal lifespans when treatment is accessible and taken consistently.
The timeline from those five unexplained cases in Los Angeles to a treatable chronic condition spans just over four decades. The key dates: 1981 for the first clinical recognition, 1982 for the name AIDS, 1983 for the identification of the virus, and 1986 for the name HIV.