I forgot Wool as well.
Yeah, everyone is obsessed with anti-bac this, sterile that. Kids get no immune system and end up sickly adults...though that is not necessarily tied to intolerance.
Reason why there's so much allegy ridden young-uns around is because parents are overprotective. We used to run around in the mud, rain, strange dogs around, no one minded if dogs licked our face and so forth. Get some resistance in that body