It's true. Let kids run around outside and get dirty and gross.

The current kids who are being bathed in hand sanitizer and forced to be rigidly Communist-style levels of clean will be weak adults in 15 years.

Infants who are naturally-birthed and breastfed by healthy mothers have very powerful immune systems. The best way to maintain it is to avoid the use of the primary medical products intended to permanently alter the immune system.

As i like to say: "Dirt is clean." Nature's dirt. How else you gonna build some immunity?