The other point is that if researchers did a genetic study that did in fact show less virulence in the non-sanguine group, they could mistakenly conclude that PA types have an intrinsic relative immunity to the virus, whereas the effect is a secondary one resulting from genetically driven social behavior. Just something to keep in mind.
Regarding the Influenza pandemic of 1918, the present pandemic may turn out to be worse because of the present higher level of urbanization, greater population mobility, and especially if transmission of the virus by asymptomatic carriers turns out to be highly significant.
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