The U.S. vaccination program is moving fast, but health officials are concerned about the rapid spread of coronavirus variants. Politico health journalist Alice Miranda Ollstein accompanies Red and Blue presenter Elaine Quijano with more information on how the government is dealing with a wave of new cases at five hotspots, a possible link between the vaccine and AstraZeneca (not used in the US) and blood clots and the challenges associated with locating contacts.
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