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                        | What does it mean when you have COVID-19, but don’t know how you got it? |  |  
    
        
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                        | Imagine this: You’ve been working from home since March. You always wear a mask in public over your mouth and your nose. You’re fastidious about hand-washing. Your social calendar primarily includes trips to the supermarket and Zoom happy hours. You’ve perfected the art of turning down invitations to parties, weddings, and Scrabble nights, until a coronavirus vaccine becomes available. 
 But somehow, somewhere, you still got infected with COVID-19. What happened?
 
 Read the full story.
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