Health & Safety Understanding 'immunity debt', or why so many kids seem to be falling sick at once 7:48am December 04, 2022 by Ayesha Rascoe Share URL copied to clipboard! Copyright 2022 NPR. To see more, visit https://www.npr.org. 300x250 Ad 300x250 Ad Support quality journalism, like the story above, with your gift right now. Donate