“Preeti Malani, MD, chief health officer and professor of medicine, division of infectious diseases, at the University of Michigan, said how long natural immunity lasts is unknown”
And they’re not bothering to find out, evidently.
It is being followed same as vaccine immunity. The reason it is unknown is there is not a drop off in immunity so far in either the vaccinated or natural cases. If and when. we see immunity abs antibody levels wane the. we will know how long immunity lasfs