Here's a few results from a quick internet search
by elcortez01 (2021-04-15 13:21:58)

In reply to: I'm very curious what, exactly, you've read on this.  posted by ndroman21


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.



Replies: