https://www.nih.gov/news-events/nih-research-matters/lasting-immunity-found-after-recovery-covid-19
Note the last line of the article from NIH (The National Institutes of Health). What they actually KNOW is that:
Lasting immunity occurs after recovery from covid.
What they HOPE is that:
The vaccine will perform as well as natural immunity from previous infection. HOPE! No data.
What will happen in about 6mo, is they will say that neither lasts more than about a year, plus there are these scary new variants! So in the name of the common good...
Annual vaccinations are required for everyone, forever.
They will also ramp up, slowly over time, doing everything they can get away with to make the lives of people who fail to comply with annual vaccinations so miserable, that they are highly likely to comply, whether they actually want to or not.