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A coronavirus pandemic is sweeping the world, but what exactly is a virus? Is it alive?

Joel Shannon, USA TODAY Comments Off on A coronavirus pandemic is sweeping the world, but what exactly is a virus? Is it alive?

They're invisible and can make us sick — but how? And why is it so hard for scientists to stop a new virus?

      
Joel Shannon, USA TODAY
http://api-internal.usatoday.com.akadns.net

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