Dr. Alan Jones, chair of the University of Mississippi Medical Center's Department of Emergency Medicine, speaks of the need to establish a mobile field clinic in the basement of a parking lot at the facility, as staff prepare for more coronavirus cases, Wednesday, April 8, 2020 in Jackson, Miss. (AP Photo/Rogelio V. Solis)

Friendship Medical Clinic employee Kevin Parks gets ready to administer a Covid-19 test at their clinic in Ecru, Miss., Friday, April 3, 2020. (Thomas Wells/The Northeast Mississippi Daily Journal via AP)

This is one of the 24 bays that are spaced out and separated from the others in the basement of a parking structure on the campus of the University of Mississippi Medical Center in Jackson, Miss., Wednesday, April 8, 2020. The mobile field clinic was built in anticipation of more coronavirus cases. (AP Photo/Rogelio V. Solis)

University of Mississippi Medical Center Vice Chancellor Dr. LouAnn Woodward, center, speaks of the need to establish a mobile field clinic in the basement of a parking lot at the facility, as staff prepare for more coronavirus cases, as department heads flank her, Wednesday, April 8, 2020 in Jackson, Miss. (AP Photo/Rogelio V. Solis)

Dr. Charles Robertson, an assistant professor of anesthesiology at the University of Mississippi Medical Center shows the simple "last resort" ventilator he and a group of pediatric nurses and physicians designed and built in Jackson, Miss., Tuesday, April 7, 2020. The group has built and tested 170 Robertson Ventilators made of items such as tubing, garden hose, and a digital timer found at local hardware stores. The medical school hopes to fast track approval by the U.S. Food and Drug Administration so they can be put into use should they be needed. (AP Photo/Rogelio V. Solis)

In this Monday, April 6, 2020 photo, U.S. postal carrier Hakeem Watson wears both gloves and a mask as he delivers the mail to homes along Magnolia Street in Tupelo, Miss. (Thomas Wells/The Northeast Mississippi Daily Journal via AP)

Medical supplies are laid out in the new mobile field clinic built in the basement of a parking garage on the campus of the University of Mississippi Medical Center in Jackson, Miss., Wednesday, April 8, 2020. Included in the supply cabinet are bottles of locally sourced hand sanitizer. The facility was built in anticipation of more coronavirus cases. The clinic will have a maximum capacity of around 24 patients, with each bay spaced out and separated from the others. (AP Photo/Rogelio V. Solis)

Dr. Charles Robertson, an assistant professor of anesthesiology at the University of Mississippi Medical Center demonstrates how the simple "last resort" ventilator he and a group of pediatric nurses and physicians designed and built, operates in Jackson, Miss., Tuesday, April 7, 2020. The group has built and tested 170 Robertson Ventilators made of items such as tubing, garden hose, and a digital timer found at local hardware stores. The medical school hopes to fast track approval by the U.S. Food and Drug Administration so they can be put into use should they be needed. (AP Photo/Rogelio V. Solis)

Medical professionals review procedure at the University of Mississippi Medical Center, while waiting for a "dry run" to begin, testing the efficiency of a new mobile field clinic built in the basement of a parking garage in Jackson, Miss., Wednesday, April 8, 2020. The facility was built in anticipation of more coronavirus cases. The clinic will have a maximum capacity of around 24 patients, with each bay spaced out and separated from the others. (AP Photo/Rogelio V. Solis)

State Epidemiologist Dr. Paul Byers, left, answers questions about the state's testing for COVID-19 and new community recommendations, while Mississippi Emergency Management Agency executive director Greg Michel listens at a press conference in Jackson, Miss., Thursday, March 12, 2020. For most people, the new coronavirus causes only mild or moderate symptoms. For some it can cause more severe illness. (AP Photo/Rogelio V. Solis)