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Rosy, 6, gives COVID tests and vaccines to her stuffed animals. She herself has been exposed to SARS-CoV-2, the coronavirus that causes COVID-19, multiple times and never tested positive. What's her secret? Michaeleen Doucleff/NPR hide caption

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Michaeleen Doucleff/NPR

Why hasn't my daughter caught COVID? 2 factors likely protect her — and maybe you too

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