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Half of U.S. adults vaccinated against Covid ahead of July Fourth goal

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Half of adults in the U.S. are now fully vaccinated against Covid-19, putting the Biden Administration ahead of its goal of 70 percent of Americans to have at least one shot by July 4th. NBC News’ Maura Barrett breaks down why the CDC is still cautious of new daily infections and what the White House is saying about the origins of the virus.