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Post being replied to

Here's a few results from a quick internet search by elcortez01

From Childrens' Hospital of Philly: https://www.chop.edu/centers-programs/vaccine-education-center/vaccine-safety/immune-system-and-health

From Michigan's Department of Health with citations to CDC: https://www.michigan.gov/documents/mdch/Waiver_Ed_Natural_Immunity_479884_7.pdf

I agree that immunity is likely variable and difficult to study.