b'The head of the Centers for Disease Control and Prevention told Congress that a widely-available vaccine probably won\'t be available until well into 2021. But he did say that masks are perhaps even more useful in preventing the spread. That will prove especially true if people are reluctant to take the vaccine.
This episode: White House reporter Ayesha Rascoe, congressional reporter Claudia Grisales, and science correspondent Joe Palca.
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