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An Anonymous Coward writes:

Apparently influenza A flus come in two main varieties, the H1 and the H7. When you had your first flu when you were young you got good defenses against that subfamily according to researchers from the University of Arizona and UCLA. This explains why sometimes old and sick people can weather an influenza better than young and healthy people. This insight might have important implications in case of a pandemic.

https://uanews.arizona.edu/story/birth-year-predicts-odds-if-flu-pandemic-were-strike [arizona.edu]

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