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'Dirt Is Good': Why Kids Need Exposure To Germs

Lulu Garcia-Navarro

NPR

Jul 17, 2017

"It turned out that most of the exposures were actually beneficial," Gilbert says. "So that dirty pacifier that fell on the floor — if you just stick it in your mouth and lick it, and then pop it back in little Tommy's mouth, it's actually going to stimulate their immune system. Their immune system's going to become stronger because of it."