Here's How Moderna Plans to Beat the Biggest Threat to Its Vaccine

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via Moderna's (NASDAQ:MRNA) vaccine is successfully helping people avoid the coronavirus. The billion-dollar product has demonstrated more than 90% efficacy in adults. And new data show it's 100% effective in teens. But Moderna faces one big challenge that could wreak havoc on how well its vaccine protects the population. And that's the rapid emergence of variants.

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