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US obesity epidemic could undermine effectiveness of a Covid-19 vaccine

For a world crippled by the coronavirus, salvation hinges on a vaccine. But in the United States, where at least 4.6 million people have been infected and nearly 155,000 have died, the promise of that vaccine is hampered by a vexing epidemic that long preceded Covid-19: obesity.

By Sarah Varney, Kaiser Health News/CNN

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