Susceptibility/Predisposition to Infectious Disease Why is it that some people always seem to get the flu and others don't? Why are some individuals more susceptible to SARS CoV-2?   1) links between human genetic variation and susceptibility to a specific infectious disease (e.g., Neanderthal DNA and Covid), 2) link between aging and a specific infectious disease 3) links between stress, nutrition, or exercise and a specific infectious disease.

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