Gaëtan Dugas

Gaëtan Dugas was a Canadian flight attendant whose central role in an early AIDS transmission network led to his false portrayal as the origin of North America’s epidemic.

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Patient Zero: A label for the earliest identified case in an outbreak; in AIDS research, it arose from a study code misread as a numeral. The label attached to Dugas began as a code for his position in a transmission study.
HIV: Human immunodeficiency virus, a virus that attacks immune cells and can cause AIDS without effective treatment. The virus, not an individual, caused the epidemic Dugas was accused of starting.
AIDS stigma: Prejudice and discrimination directed at people with AIDS or associated with HIV. The Patient Zero narrative reinforced stigma by framing transmission as one person’s culpable act.
HIV molecular epidemiology: The use of viral genetic data and epidemiological evidence to study HIV transmission and spread. This field supplied evidence overturning the claim that Dugas began the epidemic.
AIDS epidemic in the United States: The spread of AIDS in the United States, recognized in 1981 and caused by HIV. Dugas was wrongly cast as the epidemic’s starting point, though HIV circulated earlier.
HIV-1 group M: The major group of HIV-1 responsible for the global AIDS pandemic. Its ancestry and spread predate Dugas’s involvement in North American transmission networks.
Scapegoating: The practice of assigning blame for a wider problem to a person or group. Dugas became a human target for fear and anger about an epidemic with many causes.
Viral phylogeography: The reconstruction of how viruses spread geographically using genetic and location data. It helps trace HIV’s movement while leaving gaps in individual transmission histories.
HIV/AIDS in Canada: The history and public-health response to HIV and AIDS in Canada. Dugas’s life and public portrayal unfolded within Canada’s experience of the epidemic.
Phylogenetic analysis: The study of evolutionary relationships by comparing inherited characteristics, including DNA or RNA sequences. Viral sequence analysis later showed Dugas was not at the root of the sampled epidemic.