It would be nice if the article offered what the outcome was when measuring a group of previously infected but unvaccinated so that the whole picture is clear. Since the vax wanes, what happens at the threshold between the two? There is not point in offering a suggestion of "powerful" or "ongoing" immunity if it depends on....ongoing vaccination....because that isn't immunity then, it is temporary protection....what happens at that line, for the previously infected, both vaxed and un-vaxed, when the vaccination wears off? Those are the numbers that matter going forward, especially for the population NOT in risk groups, that is, the majority.