Haven't checked but here's a new article that in assuming is based on the study except more emphasis on children:Also, studies show antibodies alone aren't enough to determine immunity. Memory B cells (which remember how to make antibodies when needed/reinfected) are at least as robust, if not more, in natural infection.
Covid infection 'produces stronger immune response than the vaccine'
Memory B cells continue to evolve and get stronger for at least several months after natural infection, producing antibodies that can neutralise new variants. Vaccines induce less B cells.
www.google.com
While antibodies wane around 6 months for both vaxxed and naturally immune, the memory b cells are more important bc they can produce antibodies when it's needed again. This is more robust in Nat immunity than vaxx shots.
And considering kids are naturally better protected from Covid severity and hospitalization/death, it's not as necessary to vaxx them all. Delta comes with an increase in cases due to heightened transmission but not increase in severity.