If you’ve been feeling guilty because you can’t keep your house spotless, stop.

As it turns out, allowing the odd germ to flourish here or there just might be saving your kid from a lifetime of allergies, Dr. Nancy Snyderman explained on "NBC Nightly News with Brian Williams" Monday.

It seems counterintuitive, but that’s exactly what the so-called "hygiene hypothesis" suggests. You can actually be too clean for your own good...

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