>only got to in 2015 I think a lot of the delay is it took a while for people to realise there was a problem. The perhaps excessive hygiene thing didn't really

>only got to in 2015 I think a lot of the delay is it took a while for people to realise there was a problem. The perhaps excessive hygiene thing didn't really get going till the 1960s and so you didn't really see the rise in allergies till a couple of decades after, then maybe scientists started figuring it like in the 90s and then it takes a while to get proven enough to recommend to parents?