The new strains of coronavirus have been very concerning when it comes to vaccine efficacy, but Moderna, maker of one of the approved vaccines in the U.S. has said that their shots are effective against South African and U.K. variants. Still, they are exploring making a booster shot and a new version of the vaccine to combat the South African strain, in which scientists see sharp declines of antibody levels in people. Peter Loftus, healthcare reporter at the WSJ, joins us for Moderna's vaccine plans.

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