I am waiting for the environment alarmists to respond to this proof.
https://www.webmd.com/parenting/d2n-stopping-germs-12/kids-and-dirt-germs
https://www.webmd.com/parenting/d2n-stopping-germs-12/kids-and-dirt-germs
A mounting body of research suggests that exposing infants to germs may offer them greater protection from illnesses such as allergies and asthma later on in life.