Gaëtan Dugas is frequently referred to as the individual who began the spread of HIV within the gay male community in North America in the 1970s. In epidemiology he is known as the:

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The term 'index case' refers to an individual who is the first known case of a particular disease or outbreak. In this case, Gaëtan Dugas is considered to be the index case of HIV in North America. Some may also use the term 'patient zero' to refer to him, but this term has been largely discredited as it implies blame for the spread of the disease.

Gaëtan Dugas Is Frequently Referred to as the Individual Who