Dr. Hotez: New Covid Variant 'Likely' Already in the United States

Co-director of the Center for Vaccine Development at Texas Children's Hospital, Dr. Peter Hotez, joined Chris Jansing to react to the new Covid variant just detected in South Africa. NBC News' Raf Sanchez reports on the global response and Gary Grumbach shares what he's seeing at testing sites. "There's more we don't know than do know," Hotez says.» Subscribe to MSNBC: http://on.msnbc.com/SubscribeTomsnbc

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Dr. Hotez: New Covid Variant 'Likely' Already in the United States