St. Louis County's announcement Tuesday that 15 new cases of COVID-19 have been reported was surprising for a lot of reasons.
For one thing, it was one of the first times the new cases weren't connected to an outbreak in a congregate living facility, like longterm care.
For another, nine of the 15 cases involved people under 30.
Now begins the work of "contact tracing." It's too early to have exact information but it seems that travel out of Minnesota may have played a part.