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U.K. officials say new COVID-19 strain appears to be 70% more contagious

European countries are closing their borders to travelers from the U.K. to try to head off the spread of a new variant of COVID-19 that appears to be even more infectious. Immunotherapy scientist Dr. Leo Nissola joins CBSN's "Red & Blue" anchor Tanya Rivero with more on how current vaccines will stack up against the new strain.
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