Read the paper yourself. It is free at the link and id doesn't say what some folks think it says. People should not be like baby birds and have suspect mother regurge spoiled worms down their craws.

Here is the conclusion from preprint. Note that it says those with natural immunity needa BOOST.

"Protection from reinfection decreases with time since previous infection, but is, nevertheless, higher than that conferred by vaccination with two doses at a similar time since the last immunity-conferring event. A SINGLE VACCINE DOSE AFTER INFECTION HELPS RESTORE PROTECTION".

"In agreement with other studies,(6,7,21) we found that after several months persons with hybrid immunity are better protected against further infection than uninfected persons who have received two vaccine doses (the Vaccinated cohort). Furthermore, we found that a single dose of vaccine given to a previously infected individual or to an uninfected doubly vaccinated individual (i.e., a booster dose) restores the protection to the level in the early months following recovery or vaccination. The timing of vaccination following infection affects the protection6. Figure S2 presents the distribution of time between infection and vaccination in our database. However, we did not have enough data to evaluate the level of protection as a function of time between infection and vaccination while taking the waning effect into account."
[Post edited by Va AandM at 01/27/2022 09:07AM]