Shanghai Ballet dancers wearing masks practise in a dance studio in Shanghai, China, as the country is hit by an outbreak of the novel coronavirus, February 20, 2020. (Photo by Aly Song/Reuters)

An Indian lift operator stands inside a dedicated lift for people suspected to be infected with the new corona virus at the Government Gandhi Hospital in Hyderabad, India, Monday, March 2, 2020. Coronavirus has spread to more than 60 countries, and more than 3,000 people have died from the COVID-19 illness it causes. (Photo by Mahesh Kumar A./AP Photo)

A specialist from a local veterinary service wears a protective suit as sprays disinfectant near Russian tanks displayed at area near Proryv (The Breakthrough) museum dedicated to the breakthrough of the Siege of Leningrad during World WarII near Kirovsk, about 30 kilometres (19 miles) east of St.Petersburg, Russia, Thursday, April 2, 2020. (Photo by Dmitri Lovetsky/AP Photo)

A robot, developed by start-up firm Asimov Robotics, holds a tray with face masks and sanitizer after the two robots were launched to spread awareness about the coronavirus, in Kochi, India, March 17, 2020. (Photo by Sivaram V/Reuters)

Peng Jing, 24, attends her wedding photography shoot after the lockdown was lifted in Wuhan, capital of Hubei province and China's epicentre of the novel coronavirus disease (COVID-19) outbreak, April 15, 2020. (Photo by Aly Song/Reuters)

Local youth representatives dressed a Stormtrooper and Darth Vader (L-in black) from the Star Wars film franchise patrol in a wooden boat around a submerged village to remind residents to stay at home during the enhanced community quarantine in suburban Manila on May 6, 2020, as part of government's efforts to combat the spread of the COVID-19 coronavirus. (Photo by Ted Aljibe/AFP Photo)

Agriculture Secretary Sonny Perdue adjusts his mask before an event in the Roosevelt Room of the White House, Tuesday, May 19, 2020, in Washington. (Photo by Evan Vucci/AP Photo)

A trader carries his mannequins as he closes his business ahead of the lockdown restrictions set by the government to prevent the spread of the coronavirus disease (COVID-19), in Eastleigh district of Nairobi, Kenya on May 6, 2020. (Photo by Thomas Mukoya/Reuters)