Belgium's Prime Minister Sophie Wilmes talks during a news conference following a meeting of the National Security Council amid the coronavirus outbreak in Brussels, Monday, July 27, 2020. Belgian Prime Minister Sophie Wilmes unveiled Monday a new set of drastic social distancing measures aimed at avoiding a new general lockdown amid a surge of COVID-19 infections. (Francois Lenoir, Pool Photo via AP)

Mississippi Gov. Tate Reeves, left, listens as State Health Officer Dr. Thomas Dobbs, discusses the state's efforts to reduce and limit transmission from the COVID-19 virus, Monday, July 20, 2020, during a press briefing in Jackson, Miss. (AP Photo/Rogelio V. Solis)

Robin Garcia sits at a laptop to walk a parent through the process of registering their kids for classes at Ector County Independent School District's first day of their Registration Roadshow Monday, July 27, 2020. Classes start Aug. 12 for ECISD in Odessa Texas, and registration is required for all students whether they are sending their kids to campus or staying at home for remote learning. (Ben Powell/Odessa American via AP)

A man wearing a face mask to help protect against the spread of the new coronavirus checks the lighting before the commemorating ceremony for the U.N. Forces Participating Day in the Korean War in Seoul, South Korea, Monday, July 27, 2020. (AP Photo/Lee Jin-man)

A man wearing a face mask and a shield walks past a bank's electronic board showing the Hong Kong share index at Hong Kong Stock Exchange Monday, July 27, 2020. Asian stock markets were mixed Monday amid U.S.-China tension and concern a recovery from the coronavirus pandemic might be weakening. (AP Photo/Vincent Yu)

FILE - In this June 24, 2020 file photo, Robert O'Brien, assistant to the president for national security affairs, removes a face covering prior to speaking during a news conference in Phoenix. O’Brien has tested positive for the coronavirus. He’s the highest-ranking White House official to test positive so far. (AP Photo/Ross D. Franklin)

Tourists in traditional Japanese kimonos walk in Asakusa district in Tokyo Monday, July 27, 2020. The Japanese capital confirmed Monday more than 100 new coronavirus cases. (AP Photo/Eugene Hoshiko)

Neal Browning, the second person to receive a trial dose of a COVID-19 vaccine, rides his bike, Friday, July 24, 2020, in Bothell, Wash. As the world's biggest COVID-19 vaccine study gets underway more than four months after Browning and 44 others became the first participants in a phase-one coronavirus vaccine study that has produced encouraging results, more than 150,000 Americans have filled out an online registry in recent weeks signaling interest to volunteer for other studies, according to a virologist with the Fred Hutchinson Cancer Research Institute in Seattle. (AP Photo/Ted S. Warren)

Jennifer Haller, right, the first person to receive a trial dose of a COVID-19 vaccine, poses for a photo with her son Hayden, 16, and their dog Meg, Sunday, July 19, 2020, in Seattle. As the world's biggest COVID-19 vaccine study gets underway more than four months after Haller and 44 others became the first participants in a phase-one coronavirus vaccine study that has produced encouraging results, Haller is encouraging other people to sign up for future trials. (AP Photo/Ted S. Warren)

A restaurant employee wearing a protective face mask to help curb the spread of the coronavirus offer a joss sticks on a huge incense burner in the Asakusa district in Tokyo Monday, July 27, 2020. The Japanese capital confirmed Monday more than 100 new coronavirus cases. (AP Photo/Eugene Hoshiko)

A man, wearing a mask to protect against the spread of coronavirus, stands on an escalator at Rogier metro station in Brussels, Monday, July 27, 2020. Belgian Prime Minister Sophie Wilmes unveiled Monday a new set of drastic social distancing measures aimed at avoiding a new general lockdown amid a surge of COVID-19 infections. (AP Photo/Francisco Seco)