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What you need to know about breakthrough COVID-19 infections

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Health officials say breakthrough COVID-19 cases in the fully vaccinated are statistically rare. But given the spread of the more contagious delta variant, how concerned should you be? NBC’s Tom Costello investigates for In Depth TODAY.

Appearing:Savannah GutherieHoda Kotb
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S0 E04 minNRExcerptNews and InformationDaytime
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