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Knox County Schools have canceled for Friday, March 13, because of concerns related to the coronavirus.

The decision was made after a case was confirmed in Knox County on Thursday. KCS will use the time to "get an early start on deep cleaning facilities," they said in a tweet.

All activities, including athletic events, are cancelled for Friday, said KCS spokeswoman Carly Harrington.

In addition, an email to parents from Knox County Schools Superintendent Bob Thomas said, "the district will suspend all out-of-state, school-sponsored and business-related travel indefinitely."

There have beeneighteen confirmed cases of coronavirus in Tennessee: eight in Williamson County, six in Davidson County, two in Shelby County and one each in Knox and Sullivan counties.

Knox County Schools have used seven built-in emergency days that allow the district to call off school without having to make up the day. This cancellation brings that number to eight.

Once the district uses 10 emergency days, additional unplanned days off must be made up.