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Germs are sneaky—Dr. Robert Aryeetey, infectious disease expert, explains how they spread, what to watch for, and how to stay ahead of them.

Some questions he will answer:

When do you need to wear a mask in public?

What's the difference between a bacterial and a viral infection?

Is there something that people are overly concerned about that isn't a real risk?

Remember to call 911 in case of a medical emergency.