Also, turns out preventing kids from getting sick improves educational outcomes.
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However, if these results were observed in grades 3 or higher, it could suggest a more substantial phenomenon. I randomly picked the third grade, but perhaps there’s a specific age after which the medical community considers a child’s immunity to be significantly enhanced.
A good overview of the allergy situation is here: https://en.wikipedia.org/wiki/Hygiene_hypothesis
Though that article goes into more about young human immune systems too. TLDR: Yeah ... it's complicated, but the evidence seems to, just maybe, lean towards more exposure being better. So, you're right, I think?