A new study finds that households with 1 kid are infected with viruses 35% of the year, 2 kids are infected 56% of the year, and without kids are only infected 7% of the year.

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A new study finds that households with 1 kid are infected with viruses 35% of the year, 2 kids are infected 56% of the year, and without kids are only infected 7% of the year.