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H1N1, often referred to as the swine flu**, is a subtype of the influenza A virus.


On June 17, 2010, a paper authored by Joel Wertheim was published suggesting that the 1977 outbreak of H1N1 was the result of a lab leak.1)

Wertheim, J. O. (2010). The Re-Emergence of H1N1 Influenza Virus in 1977: A Cautionary Tale for Estimating Divergence Times Using Biologically Unrealistic Sampling Dates. PLoS ONE, 5(6), e11184.
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