Staff members of All Nippon Airways wearing protective masks and face shields work at a boarding gate where "social distancing" stickers are attached on its floor amid the coronavirus disease (COVID-19) outbreak at Haneda airport in Tokyo, Japan June 4, 2020. REUTERS/Kim Kyung-Hoon

A staff member of All Nippon Airways wearing a protective mask and a face shield works at a boarding gate amid the coronavirus disease (COVID-19) outbreak at Haneda airport in Tokyo, Japan June 4, 2020. REUTERS/Kim Kyung-Hoon

A woman rubs her hands with sanitizer at a check-in counter amid the coronavirus disease (COVID-19) outbreak at Haneda airport in Tokyo, Japan June 4, 2020. REUTERS/Kim Kyung-Hoon

Staff members of All Nippon Airways wearing protective masks and face shields work at a boarding gate amid the coronavirus disease (COVID-19) outbreak at Haneda airport in Tokyo, Japan June 4, 2020. REUTERS/Kim Kyung-Hoon

A staff member of All Nippon Airways wearing a face shield is seen in front of a plane at a boarding gate amid the coronavirus disease (COVID-19) outbreak at Haneda airport in Tokyo, Japan June 4, 2020. REUTERS/Kim Kyung-Hoon

A plane of All Nippon Airways is seen at Haneda airport, amid the coronavirus disease (COVID-19) outbreak, in Tokyo, Japan June 4, 2020. REUTERS/Kim Kyung-Hoon

A staff member of All Nippon Airways wearing a protective mask and a face shield asks passengers to maintain 'social distance' as they stand in a line to board a plane at a boarding gate amid the coronavirus disease (COVID-19) outbreak at Haneda airport in Tokyo, Japan June 4, 2020. REUTERS/Kim Kyung-Hoon

Staff members of All Nippon Airways wearing protective masks work behind a vinyl curtain at a check-in counter amid the coronavirus disease (COVID-19) outbreak at Haneda airport in Tokyo, Japan June 4, 2020. REUTERS/Kim Kyung-Hoon

A staff member of Japan Airlines wearing a protective face mask and gloves cleans the cabin of a plane which performed a domestic flight, amid the coronavirus disease (COVID-19) outbreak at Haneda airport in Tokyo, Japan May 26, 2020. Picture taken May 26, 2020. REUTERS/Kim Kyung-Hoon

A plane of Japan Airlines is seen at its maintenance center amid the coronavirus disease (COVID-19) outbreak at Haneda airport in Tokyo, Japan May 26, 2020. Picture taken May 26, 2020. REUTERS/Kim Kyung-Hoon

A staff member of All Nippon Airways wearing a protective mask and a face shields works at a check-in counter amid the coronavirus disease (COVID-19) outbreak at Haneda airport in Tokyo, Japan June 4, 2020. REUTERS/Kim Kyung-Hoon

A staff member of Japan Airlines wearing a protective face mask and gloves cleans the cabin of a plane which performed a domestic flight, amid the coronavirus disease (COVID-19) outbreak at Haneda airport in Tokyo, Japan May 26, 2020. Picture taken May 26, 2020. REUTERS/Kim Kyung-Hoon

Riot police try to put out fire in the middle of the street during protests over a nationwide dusk-to-dawn curfew imposed because of the coronavirus disease (COVID-19), in Dakar, Senegal June 4, 2020. REUTERS/Christophe Van Der Perre

Riot police try to put out fire in the middle of the street during protests over a nationwide dusk-to-dawn curfew imposed because of the coronavirus disease (COVID-19), in Dakar, Senegal June 4, 2020. REUTERS/Christophe Van Der Perre

A riot police officer holds a shield while others try to put out a fire in the middle of the street during protests over a nationwide dusk-to-dawn curfew imposed because of the coronavirus disease (COVID-19), in Dakar, Senegal June 4, 2020. REUTERS/Christophe Van Der Perre

Police vehicles are parked at the scene during protests over a nationwide dusk-to-dawn curfew imposed because of the coronavirus disease (COVID-19), in Dakar, Senegal June 4, 2020. REUTERS/Christophe Van Der Perre

A police armoured vehicle arrives at the scene during protests over a nationwide dusk-to-dawn curfew imposed because of the coronavirus disease (COVID-19), in Dakar, Senegal June 4, 2020. REUTERS/Christophe Van Der Perre

An ice carving robot for minimising human contact to avoid the spread of the coronavirus disease (COVID-19) is seen during its demonstration at a bar in Seoul, South Korea, June 3, 2020. Picture taken on June 3, 2020. REUTERS/Kim Hong-Ji

A carved ice block made by an ice carving robot as a measure to minimise human contact to avoid the spread of the coronavirus disease (COVID-19) rests in a glass during the robot's demonstration at a bar in Seoul, South Korea, June 3, 2020. Picture taken on June 3, 2020. REUTERS/Kim Hong-Ji

An ice carving robot carves an ice cube as a measure to minimise human contact to avoid the spread of the coronavirus disease (COVID-19) during its demonstration at a bar in Seoul, South Korea, June 3, 2020. Picture taken on June 3, 2020. REUTERS/Kim Hong-Ji

An ice carving robot for minimising human contact to avoid the spread of the coronavirus disease (COVID-19) is seen during its demonstration at a bar in Seoul, South Korea, June 3, 2020. Picture taken on June 3, 2020. REUTERS/Kim Hong-Ji

An ice carving robot carves an ice cube as a measure to minimise human contact to avoid the spread of the coronavirus disease (COVID-19) during its demonstration at a bar in Seoul, South Korea, June 3, 2020. Picture taken on June 3, 2020. REUTERS/Kim Hong-Ji

Drink Bot makes a cocktail as an employee wearing a mask to avoid the spread of the coronavirus disease (COVID-19) looks on at a cafe in Seoul, South Korea, June 3, 2020. Picture taken on June 3, 2020. REUTERS/Kim Hong-Ji

Dessert Bot is seen as an employee wearing a mask to avoid the spread of the coronavirus disease (COVID-19) takes an order at a cafe in Seoul, South Korea, June 3, 2020. Picture taken on June 3, 2020. REUTERS/Kim Hong-Ji

An employee wearing a mask to avoid the spread of the coronavirus disease (COVID-19) works at a cafe in Seoul, South Korea, June 3, 2020. Picture taken on June 3, 2020. REUTERS/Kim Hong-Ji

Drip Bot makes a cup of coffee as an employee wearing a mask to avoid the spread of the coronavirus disease (COVID-19) works at a cafe in Seoul, South Korea, June 3, 2020. Picture taken on June 3, 2020. REUTERS/Kim Hong-Ji

Drink Bot makes a cocktail as a measure to minimise human contact to avoid the spread of the coronavirus disease (COVID-19) at a cafe in Seoul, South Korea, June 3, 2020. Picture taken on June 3, 2020. REUTERS/Kim Hong-Ji

Drink Bot makes a cocktail as a measure to minimise human contact to avoid the spread of the coronavirus disease (COVID-19) at a cafe in Seoul, South Korea, June 3, 2020. Picture taken on June 3, 2020. REUTERS/Kim Hong-Ji

Hand sanitizer is shown by slot machine ahead of the June 4 reopening of The D casino, closed by the state since March 18, 2020 as part of steps to slow the spread of the coronavirus disease (COVID-19), in downtown Las Vegas, Nevada, U.S. June 3, 2020. REUTERS/Steve Marcus

A worker cleans slot machines ahead of the June 4 reopening of The D hotel-casino, closed by the state since March 18, 2020 as part of steps to slow the spread of the coronavirus disease (COVID-19), in downtown Las Vegas, Nevada, U.S. June 3, 2020. REUTERS/Steve Marcus

Andres Delgado cleans a bar video poker machine as workers prepare for the June 4 reopening of The D hotel-casino, closed by the state since March 18, 2020 as part of steps to slow the spread of the coronavirus disease (COVID-19), in downtown Las Vegas, Nevada, U.S. June 3, 2020. REUTERS/Steve Marcus

Employee Alex Hurley has her temperature checked as she enters the D-hotel-casino, closed by the state since March 18, 2020 as part of steps to slow the spread of the coronavirus disease (COVID-19), in preparation for the June 4 reopening in downtown Las Vegas, Nevada, U.S. June 3, 2020. REUTERS/Steve Marcus

Chris Scott cleans a chair at the Long Bar as workers prepare for the June 4 reopening of The D hotel-casino, closed by the state since March 18, 2020 as part of steps to slow the spread of the coronavirus disease (COVID-19), in downtown Las Vegas, Nevada, U.S. June 3, 2020. REUTERS/Steve Marcus

Blackjack dealer Lydia Clark waits by a table as workers prepare for the June 4 reopening of The D hotel-casino, closed by the state since March 18, 2020 as part of steps to slow the spread of the coronavirus disease (COVID-19), in downtown Las Vegas, Nevada, U.S. June 3, 2020. REUTERS/Steve Marcus

Miguel Regalado cleans a slot machine as workers prepare for the June 4 reopening of The D hotel-casino, closed by the state since March 18, 2020 as part of steps to slow the spread of the coronavirus disease (COVID-19), in downtown Las Vegas, Nevada, U.S. June 3, 2020. REUTERS/Steve Marcus

Migrants from Africa, Cuba and Haiti who are stranded in Honduras after borders were closed due to the coronavirus (COVID-19) pandemic, board a bus going towards to a shelter during their trek northward in an attempt to reach the U.S., in Tegucigalpa, Honduras June 3, 2020. REUTERS/Jorge Cabrera

Migrants from Africa, Cuba and Haiti who are stranded in Honduras after borders were closed due to the coronavirus (COVID-19) pandemic, board a bus going towards to a shelter, during their trek northward in an attempt to reach the U.S., in Tegucigalpa, Honduras June 3, 2020. REUTERS/Jorge Cabrera

A migrant looks on while in a bus with fellow migrants from Africa, Cuba and Haiti who are stranded in Honduras after borders were closed due to the coronavirus (COVID-19) pandemic, before heading to a shelter, during their trek northward in an attempt to reach the U.S., in Tegucigalpa, Honduras June 3, 2020. REUTERS/Jorge Cabrera

A migrant looks at a child as fellow migrants from Africa, Cuba and Haiti who are stranded in Honduras after borders were closed due to the coronavirus (COVID-19) pandemic, before heading to a shelter, during their trek northward in an attempt to reach the U.S., in Tegucigalpa, Honduras June 3, 2020. REUTERS/Jorge Cabrera

A demonstrator wearing a face mask as a preventive measure against the coronavirus disease (COVID-19), holds a sign that reads "I can't breathe, black lives matter" during a protest against the death in Minneapolis police custody of George Floyd and the arrival of U.S. troops in Colombian territory, in Bogota, Colombia June 3, 2020. REUTERS/Luisa Gonzalez

Demonstrators wearing face masks as a preventive measure against the coronavirus disease (COVID-19), gesture during a protest against the death in Minneapolis police custody of George Floyd and the arrival of U.S. troops in Colombian territory, in Bogota, Colombia June 3, 2020. REUTERS/Luisa Gonzalez

A demonstrator wearing a face mask as a preventive measure against the coronavirus disease (COVID-19), holds a sign that reads "George Floyd, justice" during a protest against the death in Minneapolis police custody of George Floyd and the arrival of U.S. troops in Colombian territory, in Bogota, Colombia June 3, 2020. REUTERS/Luisa Gonzalez

Migrants from Africa, Cuba and Haiti, who are stranded in Honduras after borders were closed due to the coronavirus (COVID-19) pandemic, are pictured before boarding a bus going towards a shelter, during their trek northward in an attempt to reach the U.S., in Tegucigalpa, Honduras June 3, 2020. REUTERS/Jorge Cabrera

A migrant talks to fellow migrants from Africa, Cuba and Haiti who are stranded in Honduras after borders were closed due to the coronavirus (COVID-19) pandemic, before heading to a shelter, during their trek northward in an attempt to reach the U.S., in Tegucigalpa, Honduras June 3, 2020. REUTERS/Jorge Cabrera

Migrants from Africa, Cuba and Haiti who are stranded in Honduras after borders were closed due to the coronavirus (COVID-19) pandemic, are seen inside a bus going towards to a shelter, during their trek northward in an attempt to reach the U.S., in Tegucigalpa, Honduras June 3, 2020. REUTERS/Jorge Cabrera

A demonstrator wearing a face mask as a preventive measure against the coronavirus disease (COVID-19), holds a sign that reads "A.C.A.B ("All Cops Are Bastards")" during a protest against the death in Minneapolis police custody of George Floyd and the arrival of U.S. troops in Colombian territory, in Bogota, Colombia June 3, 2020. REUTERS/Luisa Gonzalez

Family members surround the coffin containing the body of a 52-year old woman who died of the coronavirus disease (COVID-19), at the San Rafael cemetery in Mexico City, Mexico, June 3, 2020. REUTERS/Carlos Jasso

Cemetery workers dig new graves at a designated area for people who died of the coronavirus disease (COVID-19) at the San Lorenzo Tezonco cemetery in Mexico City, Mexico, June 3, 2020. REUTERS/Carlos Jasso

Cemetery workers and family members carry a coffin containing the body of a person who died of the coronavirus disease (COVID-19), into a grave at the San Lorenzo Tezonco cemetery in Mexico City, Mexico June 3, 2020. REUTERS/Carlos Jasso

Family members look on during the burial of their relative, who died of the coronavirus disease (COVID-19), at the San Lorenzo Tezonco cemetery in Mexico City, Mexico June 3, 2020. REUTERS/Carlos Jasso

Family members say their last goodbyes to their relative who died of the coronavirus disease (COVID-19), at the San Lorenzo Tezonco cemetery in Mexico City, Mexico June 3, 2020. REUTERS/Carlos Jasso

Village health volunteers wearing face masks and shields train before visiting houses to prevent the spread of the coronavirus disease (COVID-19) in Ang Thong province, Thailand, May 27, 2020. Picture taken May 27, 2020. REUTERS/Athit Perawongmetha

Village health volunteer Surin Makradee, 77, checks the temperature of a man under quarantine during visits to houses to prevent the spread of the coronavirus disease (COVID-19) in Ang Thong province, Thailand, May 27, 2020. Picture taken May 27, 2020. REUTERS/Athit Perawongmetha

Surin Makradee, 77, and other village health volunteers wearing face masks and shields ride their motorcycles during visits to houses to prevent the spread of the coronavirus disease (COVID-19) in Ang Thong province, Thailand, May 27, 2020. Picture taken May 27, 2020. REUTERS/Athit Perawongmetha

Village health volunteer Surin Makradee, 77, wears a face mask and a shield as he rides his motorcycle during visits to houses to prevent the spread of the coronavirus disease (COVID-19) in Ang Thong province, Thailand, May 27, 2020. Picture taken May 27, 2020. REUTERS/Athit Perawongmetha

Village health volunteers wearing face masks and shields ride a motorcycle during visits to houses to prevent the spread of the coronavirus disease (COVID-19) in Ang Thong province, Thailand, May 27, 2020. Picture taken May 27, 2020. REUTERS/Athit Perawongmetha

Village health volunteer Surin Makradee, 77, poses as she wears a face mask and shield after visiting houses to prevent the spread of the coronavirus disease (COVID-19) in Ang Thong province, Thailand, May 27, 2020. Picture taken May 27, 2020. REUTERS/Athit Perawongmetha

Village health volunteer Surin Makradee, 77, wears a face mask and shield before visiting houses to prevent the spread of the coronavirus disease (COVID-19) in Ang Thong province, Thailand, May 27, 2020. Picture taken May 27, 2020. REUTERS/Athit Perawongmetha

Surin Makradee, 77, gestures along other village health volunteers wearing face masks and shields as they leaves a house after a visit to prevent the spread of the coronavirus disease (COVID-19) in Ang Thong province, Thailand, May 27, 2020. Picture taken May 27, 2020. REUTERS/Athit Perawongmetha

Village health volunteers wearing face masks and shields discuss before visiting houses to prevent the spread of the coronavirus disease (COVID-19) in Ang Thong province, Thailand, May 27, 2020. Picture taken May 27, 2020. REUTERS/Athit Perawongmetha