Being older is a good defense against 2009 H1N1 influenza virus

Why is the incidence of infection with 2009 H1N1 influenza highest among 5-24 year olds, and lowest in those over 65 years of age? Were the oldsters previously infected with a related influenza virus, or is there another explanation? The sera of individuals born in the early part of the 20th century have antibodies that …

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