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Concern grows as Delta variant of coronavirus spreads in U.S.

The Delta coronavirus variant is responsible for virus cases rising in all 50 U.S. states. Unvaccinated Americans are experiencing most of the severe COVID-19 cases, CBS News' Mark Strassman reports. Dan Diamond, a reporter for The Washington Post, tells CBSN's Lana Zak more about the state of the virus in the country.
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