NASHVILLE, Tenn. (WTVF) — Editor's Note: Since the publication of this article, three more cases of coronavirus in the state of Tennessee have been announced, bringing the total to seven.

A fourth case of COVID-19 has been confirmed in Tennessee.

The Tennessee Department of Health hasn't confirmed where the fourth case is from. The previous three cases are in Williamson, Davidson and Shelby County, Tennessee.

Earlier today, the Dept. of Health announced that COVID-19 testing is now authorized seven days a week, and set up a Public Information Line at 1-877-857-2945. We tried calling that line, but it was busy. The Tennessee Department of Health responded on twitter that the line was "receiving an overwhelming number of calls" and that they encouraged Tennesseans to keep calling back.

Williamson County Schools announced that the district will close Tuesday after a parent tested positive for COVID-19. It's unclear if this is a new case or one of the known cases.