Interesting, Larry, because I read that exposure to allegens, generally, develops immunity. Scientists found that children with cat/dog dander allergies actually did better with exposure (after a time, of course). Now, maybe there's some rule regarding the 3 year mark at work here. I don't know.
But, it stands to reason that we, and our society, must be doing something to increase the allergies among children. It HAS to be an environmental factor, because I'm pretty darned sure random gene mutation isn't causing the increase in allergies.
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