Did you read the article? I think we can stop calling it a hypothesis, asthma emergency visits went down by as much as 60% within 10 years after the programme started.
Yes, and I believe the hygiene hypothesis is one of the mechanisms at play, for sure. Didn’t mean to imply otherwise. But this other idea I think could ALSO be a factor and it’s not as neat and tidy for people to understand, so it’s important to not oversimplify.