WFAA's Sonia Azad spoke with Dr. Mark Casanova, the president of Dallas County Medical Society, after several cities in the area began to announce business closures. MORE: wfaa.com/coronavirus Subscribe to WFAA: https://bit.ly/subscribetowfaa For news anytime: https://www.wfaa.com/ For the latest COVID-19 updates go to: https://www.wfaa.com/coronavirus-covi...