More time outdoors in nature playing in the dirt?

I read this article about how Finland started restoring the natural outdoor areas at daycare centers instead of using cement and plastic play areas and long story short it improved the childrens immune system functioning. I just thought this could help all of us to improve our our immune systems, if we chance to get out into nature every day.

https://www.yahoo.com/news/science/articles/finnish-daycares-ditched-pavement-mud-213539904.html