There's a good chance that most of the people you know have had COVID-19 at least once, but some people say they still have never contracted the virus. Sometimes dubbed "No-vids", it's unknown if these folks really dodged it, or just had it and didn't know.

For more on this, KCBS Radio news anchor Holly Quan spoke with John Swartzberg, Professor Emeritus of infectious diseases and vaccinology at UC Berkeley. 

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