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The pattern of disease incidence among a society is shaped broadly like a stretched out "W". First, infant
and young children are statistically more vulnerable than older children. Then there appears to be a statistical levelling off at a lower incidence until the early 20s, at which age influenza rates increase to the age of 30 or so, then decline until age forty.
Another levelling off occurs until the late 50s and on into
advanced age.