Submitted by number1dork t3_120rixo in askscience
byerss t1_jdjw4rg wrote
Reply to comment by im_thatoneguy in What happened to the old COVID variants, like Delta? Could they come back? by number1dork
H1N1/09 did hit younger people harder than older folks. I remember reading that one theory was that for 2009 older folks may have had more natural immunity because they were exposed to flu variants based on Spanish Flu.
Look up the death vs age graphs for swine flu.
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