Gaëtan Dugas (French: [gaet?~ dyga]; February 20, 1953 – March 30, 1984), a Canadian flight attendant, was a relatively early HIV patient who once was widely regarded as "Patient Zero" or the primary case for AIDS in the United States.
His case was later found to have been only one of many that began in the 1970s, according to a September 2016 study published in Nature.In March 1984, a Centers for Disease Control and Prevention (CDC) study tracked the sexual liaisons and practices of gay and bisexual men, especially in California and New York.
Dugas was code-named as "Patient O" (the letter "O," pronounced "oh") to indicate "Out-of-California." Many readers of the report—including some in the CDC—misconstrued the letter "O" to be the numeral "0" (zero), resulting in the origin of the term "Patient Zero." The extent to which HIV/AIDS was known about in the early 1980s, how it was spread, or when Dugas was diagnosed are disputed.Dugas worked as a flight attendant for Air Canada and died in Quebec City in March 1984 as a result of kidney failure caused by AIDS-related infections.