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4:02
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ABC World News Tonight with David Muir
34K views · 376 reactions | HOW VACCINES WORK: As the first COVID-19 vaccine has been approved for distribution in the US, here's a visual guide to what vaccines do—how they
ABC World News Tonight with David Muir. . HOW VACCINES WORK: As the first COVID-19 vaccine has been approved for distribution in the US, here's a visual guide to what vaccines do—how they work with our immune systems and how they're used to prevent COVID-19. https://abcn.ws/2Kh904D
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