A woman takes a book from a shelf at an outdoor book market set up, in Red Square, Moscow, Russia, Saturday, June 6, 2020. Muscovites clad in face masks and gloves ventured into Red Square for an outdoor book market, a small sign of the Russian capital's gradual efforts to open up amid coronavirus concerns. (AP Photo/Alexander Zemlianichenko Jr)

People wearing face masks to protect against the new coronavirus walk at a government event aiming to stimulate consumer demand and consumption in Beijing, Saturday, June 6, 2020. China's capital is lowering its emergency response level to the second-lowest starting Saturday for the coronavirus pandemic. That will lift most restrictions on people traveling to Beijing from Wuhan and surrounding Hubei province, where the virus first appeared late last year. (AP Photo/Mark Schiefelbein)

A volunteer measures the temperature of a resident inside the Fraga slum during a government-ordered lockdown to curb the spread of the new coronavirus, in Buenos Aires, Argentina, Saturday, June 6, 2020. (AP Photo/Natacha Pisarenko)

South Korean Park Tae-soon, left, and Park Young-soon wearing face masks to help protect against the spread of the new coronavirus pay their respects in front of the gravestone of their father Park Gong-jin who died during the Korean War, on Memorial Day at the national cemetery in Seoul, South Korea, Saturday, June 6, 2020. (AP Photo/Ahn Young-joon)

A Hindu woman performs rituals during a prayer ceremony to rid the world of coronavirus, on the banks of the river Brahmaputra in Gauhati, India, Friday, June 5, 2020. (AP Photo/Anupam Nath)

Boys wearing protective masks to help curb the spread of the coronavirus, look out the window of a train at a railway station, in Karachi, Pakistan, Saturday, Jan. 6, 2020. (AP Photo/Fareed Khan)

People wearing face masks to help protect against the spread of the new coronavirus visit to pay their respects on Memorial Day at the national cemetery in Seoul, South Korea, Saturday, June 6, 2020. (AP Photo/Ahn Young-joon)

Women working at Medic Egypt for Medical Clothes company, make protective face masks to be used to help curb the spread of the coronavirus at a factory in Menoufiya, Egypt, Saturday, June 6, 2020. Egypt has officially ordered its people to wear face masks in public and private transportation, inside government business and offices as it is easing the partial lockdown imposed. Prime Minister Mustafa Madbouly has said violators would be fined as the country has seen a jump of daily reported infections in the past week. (AP Photo/Nariman El-Mofty)

Visitors during the reopening of the Prado museum to the public in Madrid, Spain, Saturday, June 6, 2020. Madrid's Museo del Prado opened its doors on Saturday for 1,800 visitors, after its closing during the coronavirus pandemic. The visitors were required to wear face masks and have their temperature taken before taking in what the museum called its "most iconic works". (AP Photo/Manu Fernandez)

A woman read a book as she walks at an outdoor book market in the Red Square with GUM, State Department store at left, St. Basil's Cathedral, center and the Kremlin Wall, right, in Moscow, Russia, Saturday, June 6, 2020. Muscovites clad in face masks and gloves ventured into Red Square for an outdoor book market, a small sign of the Russian capital's gradual efforts to open up amid coronavirus concerns. (AP Photo/Alexander Zemlianichenko)

In this photo taken on Wednesday, June 3, 2020, Fatima Negrini, left, is flanked by nurse Laura Catena holding a cut out heart reading in Italian " Fatima 108, we love you " while posing in front of a cake celebrating her 108th birthday, at the Anni Azzurri San Faustino nursing home, in Milan, Italy. Fatima Negrini has joined the ranks of the very few centenarians who have recovered from COVID-19. (RSA Anni Azzurri San Faustino via AP)

Men in a vintage US WWII uniforms stand behind flowers left at Les Braves monument after a D-Day 76th anniversary ceremony in Saint Laurent sur Mer, Normandy, France, Saturday, June 6, 2020. Due to coronavirus measures many ceremonies and memorials have been cancelled in the region with the exception of very small gatherings. (AP Photo/Virginia Mayo)

This photo taken March 17, 2020, shows the Northern Edge Casino in Upper Fruitland, New Mexico, on the Navajo Nation. Tribes across the country have closed casinos to help slow the spread of the new coronavirus. In the U.S. Southwest, the leader of the Navajo Nation restricted travel for employees who answer to him and wrote letters to federal officials saying anyone pulled away from duty at federal health care facilities on the vast reservation wouldn't be welcome back for 45 days. (Noel Lyn Smith,The Daily Times via AP)

Volunteers wearing face masks, gloves and protective gear to protect against coronavirus, gather to clean an area of an outdoor book market set up at Red Square with GUM, State Department store, left, St. Basil's Cathedral, center, Spasskaya Tower, second with, and the Kremlin Wall, right, in Moscow, Russia, Saturday, June 6, 2020. Muscovites clad in face masks and gloves ventured into Red Square for an outdoor book market, a small sign of the Russian capital's gradual efforts to open up amid coronavirus concerns. (AP Photo/Alexander Zemlianichenko)

A woman working at Medic Egypt for Medical Clothes company makes protective face masks to be used to help curb the spread of the coronavirus at a factory in Menoufiya, Egypt, Saturday, June 6, 2020. Egypt has officially ordered its people to wear face masks in public and private transportation, inside government business and offices as it is easing the partial lockdown imposed. Prime Minister Mustafa Madbouly has said violators would be fined as the country has seen a jump of daily reported infections in the past week. (AP Photo/Nariman El-Mofty)

Reduan Elhammoudani, 45, from Syria, sleeps in a hotel entrance, closed during the coronavirus outbreak in Barcelona, Spain, Saturday, June 6, 2020. Reduan fled Syria seven years ago, after his wife and two children, 3 and 7, were killed in a bombing during the war. Since the confinement began due to the coronavirus outbreak, Reduan has subsisted thanks to the charity of the neighbourhood residents. (AP Photo/Emilio Morenatti)

Charles Norman Shay, D-Day WWII veteran and Penobscot Elder from Maine, salutes after laying a wreath during a D-Day 76th anniversary ceremony at the Normandy American Cemetery in Colleville-sur-Mer, Normandy, France, Saturday, June 6, 2020. Due to coronavirus measures many ceremonies and memorials have been cancelled in the region with the exception of very small gatherings. (AP Photo/Virginia Mayo)