Immunology question! I understand it’s a myth that, for adults, getting sick makes your immune system stronger. But infants’ immune systems do get stronger over time, from age 0 to whenever. My question: for infants, does being exposed to pathogens help the immune system mature? This is definitely part of the folk wisdom repeated to us by any number of friends and relatives—and sometimes folk wisdom is right (enough)! Any insights and links especially appreciated #immunology #publichealth #covid