A sign on the floor asks customers to maintain social distancing while on line at a bank to prevent the spread of coronavirus in Falls Church, Virginia, U.S., March 25, 2020. REUTERS/Kevin Lamarque 

A note on the door of a shop informs customers that it is closed due to the spread of the coronavirus disease (COVID-19), in Aylesbury, Buckinghamshire, Britain March 24, 2020. REUTERS/Eddie Keogh 

A man stands on a spot marked to keep the distance between clients, as part of precautionary measures against coronavirus disease (COVID-19), while waiting in line at a bank in Misrata, Libya March 22, 2020. Picture taken March 22, 2020. REUTERS/Ayman Al-Sahili 

A sign is seen on the front of a shop informing customers it is closed due to the coronavirus disease (COVID-19) on Streatham High Road in south London, Britain, March 21, 2020. Picture taken March 21, 2020. REUTERS/Hannah McKay 

A sign is seen on the front of a shop informing customers it is closed due to the coronavirus disease (COVID-19) on Streatham High Road in south London, Britain, March 21, 2020. Picture taken March 21, 2020. REUTERS/Hannah McKay 

A sign is seen on the front of a shop informing customers it is closed due to the coronavirus disease (COVID-19) on Streatham High Road in south London, Britain, March 21, 2020. Picture taken March 21, 2020. REUTERS/Hannah McKay 

A composite photograph shows signs on shop fronts informing customers of temporarily closed restaurants and shops on Streatham High Road in south London, as the UK government imposed tight restrictions to prevent the spread of the coronavirus disease (COVID-19) in Britain, March 21, 2020. Pictures taken March 21, 2020. REUTERS/Hannah McKay 

A sign is seen on the front of a shop informing customers it is closed due to the coronavirus disease (COVID-19) on Streatham High Road in south London, Britain, March 21, 2020. Picture taken March 21, 2020. REUTERS/Hannah McKay 

A sign is seen on the front of a shop informing customers it is closed due to the coronavirus disease (COVID-19) on Streatham High Road in south London, Britain, March 21, 2020. Picture taken March 21, 2020. REUTERS/Hannah McKay 

A sign is seen on the front of a shop informing customers it is closed due to the coronavirus disease (COVID-19) on Streatham High Road in south London, Britain, March 21, 2020. Picture taken March 21, 2020. REUTERS/Hannah McKay 

A sign is seen on the front of a shop informing customers it is closed due to the coronavirus disease (COVID-19) on Streatham High Road in south London, Britain, March 21, 2020. Picture taken March 21, 2020. REUTERS/Hannah McKay 

A sign is seen on the front of a shop informing customers it is closed due to the coronavirus disease (COVID-19) on Streatham High Road in south London, Britain, March 21, 2020. Picture taken March 21, 2020. REUTERS/Hannah McKay 

General view of Belfast City Hall as the spread of the coronavirus disease (COVID-19) continues. Belfast, Northern Ireland March 20, 2020. REUTERS/Jason Cairnduff 

General view of Belfast City Hall as the spread of the coronavirus disease (COVID-19) continues. Belfast, Northern Ireland March 20, 2020. REUTERS/Jason Cairnduff 

A commercial airplane descends into Reagan International Airport over the Potomac River, as Mayor Muriel Bowser issues a State of Emergency in response to the coronavirus disease (COVID-19), in Washington, U.S., March 20, 2020. REUTERS/Tom Brenner 

A woman enters a church during the spread of the coronavirus disease (COVID-19) in Hamburg, Germany, March 18, 2020. REUTERS/Fabian Bimmer 

A person prays during a holy mass inside St. Stephen's cathedral (Stephansdom) during the coronavirus disease (COVID-19) outbreak in Vienna, Austria March 18, 2020. REUTERS/Lisi Niesner 

A person walks inside St. Stephen's cathedral (Stephansdom) during the coronavirus disease (COVID-19) outbreak in Vienna, Austria March 18, 2020. REUTERS/Lisi Niesner 

Clear water is seen in Venice's canals due to less tourists, motorboats and pollution, as the spread of the coronavirus disease (COVID-19) continues, in Venice, Italy, March 18, 2020 REUTERS/Manuel Silvestri 

A homeless person sleeps near to the Colosseum in Rome, Italy, March 17, 2020. Since the coronavirus crisis, Red Cross workers have been increasing their daily activities to meet the growing needs of the homeless in Rome. With nobody around on the streets to give them food or money, and restaurants that would usually donate leftovers closed, homeless are struggling to find food and other supplies to keep them going. REUTERS/Guglielmo Mangiapane 

A Serbian army soldier patrols at the Serbia's Batrovci border crossing with Croatia's Bajakovo, as the number of coronavirus (COVID-19) cases grow around the world near Batrovci, Serbia, March 18, 2020. Under the new set of restrictions, the Serbian military will take over all border crossings and maintain guard at over a dozen state-operated camps for illegal migrants from Asia and the Middle East. REUTERS/Goran Sivacki 

General view of Nelson's Column in Trafalgar Square as the number of coronavirus (COVID-19) cases grow around the world, in London, Britain, March 18, 2020. REUTERS/Hannah McKay 

A pigeon is seen in front of the Tower of London as the spread of the coronavirus disease (COVID-19) continues, in London, Britain, March 18, 2020. REUTERS/John Sibley 

Pigeons are seen in front of the Tower of London as the spread of the coronavirus disease (COVID-19) continues, in London, Britain, March 18, 2020. REUTERS/John Sibley 

The townhall "Roemer" is reflected in a window of a closed shop during the spread of the coronavirus disease (COVID-19) in Frankfurt, Germany, March 18, 2020. REUTERS/Kai Pfaffenbach 

Pigeons are seen on a bridge in the deserted Ile Saint Louis in Paris as a lockdown is imposed to slow the rate of the coronavirus disease (COVID-19) in France, March 18, 2020. REUTERS/Christian Hartmann 

Empty chairs and tables are seen in front of a restaurant during the spread of the coronavirus disease (COVID-19) in Munich, Germany, March 18, 2020. REUTERS/Andreas Gebert 

A health worker sprays disinfectant commuters hands as the city steps up efforts to combat the spread of coronavirus disease (COVID-19) at a bus depot in Cape Town, South Africa, March 18, 2020. REUTERS/Mike Hutchings 

A bird stands on closed Paris' antique bookseller or bouquiniste along the deserted banks of the river Seine at Saint Michel district in Paris as a lockdown is imposed to slow the rate of the coronavirus disease (COVID-19) in France, March 18, 2020. REUTERS/Christian Hartmann 

A view shows the empty Trocadero square near the Eiffel tower as a lockdown is imposed to slow the spreading of the coronavirus disease (COVID-19), in Paris, France March 18, 2020. REUTERS/Gonzalo Fuentes 

Imam Ali Shrine is seen empty of people after a curfew was imposed to prevent the spread of coronavirus, in the holy city of Najaf, Iraq March 18, 2020. REUTERS/Alaa al-Marjani 

A view shows closed Paris' antique booksellers or bouquinistes along the deserted banks of the river Seine in Paris as a lockdown is imposed to slow the rate of the coronavirus disease (COVID-19) in France, March 18, 2020. REUTERS/Christian Hartmann 

A person is jogging near Tiber river, as the spread of the coronavirus disease (COVID-19) continues, in Rome, Italy March 18, 2020. REUTERS/Yara Nardi TPX IMAGES OF THE DAY 

A view of the empty Woodlands Causeway between Singapore and Malaysia after Malaysia imposed a lockdown on travel due to the coronavirus disease (COVID-19) outbreak March 18, 2020. REUTERS/Edgar Su 

A dog looks through an apartment window in a busy area of downtown Washington as restaurants, bar and museums are closed to the public as precaution due to coronavirus (COVID-19) spread, in Washington, U.S., March 17, 2020. REUTERS/Carlos Barria 

A man walks on the international bridge at the border line between Peru and Bolivia after Peru's government's announcement of the border closure in a bid to slow the spread of the new coronavirus (COVID-19), in Desaguadero, Bolivia, March 17, 2020. REUTERS/David Mercado 

A view shows an empty Zoloti Vorota station after metro shutdown amid coronavirus (COVID-19) concerns in central Kiev, Ukraine March 17, 2020. REUTERS/Valentyn Ogirenko 

A person is silhouetted against the reflections of the lights of two open pharmacies on the paviment in the empty La Bola street during partial lockdown as part of a 15-day state of emergency to combat the coronavirus disease (COVID-19) outbreak in downtown Ronda, southern Spain, March 17, 2020. REUTERS/Jon Nazca 

The Italian Prime Minister’s office Palazzo Chigi is lit up with the colours of the Italian flag to show solidarity with the country as it continues to battle coronavirus, in Rome, Italy, March 17, 2020. REUTERS/Alberto Lingria 

The Italian Prime Minister’s office Palazzo Chigi is lit up with the colours of the Italian flag to show solidarity with the country as it continues to battle coronavirus, in Rome, Italy, March 17, 2020. REUTERS/Alberto Lingria 

The Italian Prime Minister’s office Palazzo Chigi is lit up with the colours of the Italian flag to show solidarity with the country as it continues to battle coronavirus, in Rome, Italy, March 17, 2020. REUTERS/Alberto Lingria 

A detained migrant who is suspected of having coronavirus disease (COVID-19) is pictured at the infection clinic in Belgrade, Serbia, March 17, 2020. REUTERS/Marko Djurica 

Rome's Town Hall is lit up with the colours of the Italian flag to show solidarity with the country as it continues to battle coronavirus, in Rome, Italy, March 17, 2020. REUTERS/Alberto Lingria 

A detailed view of a protective gear displayed in the showcase of a souvenir-shop at the famous red-light district "Reeperbahn" during the outbreak of coronavirus disease (COVID-19) in Hamburg, Germany, March 17, 2020. REUTERS/Fabian Bimmer 

Police officer stand guard as Rome's Town Hall is lit up with the colours of the Italian flag to show solidarity with the country as it continues to battle coronavirus, in Rome, Italy, March 17, 2020. REUTERS/Alberto Lingria 

Drops of disinfectant are seen on a handle after a train carriage was sprayed to prevent the spread of coronavirus disease (COVID-19), at the main railway station in Nairobi, Kenya, March 17, 2020. REUTERS/Baz Ratner 

A medical glove resembling the continental United States is seen on the sidewalk in Jackson Heights, Queens, New York City, U.S. March 17, 2020. REUTERS/Nick Zieminski 

A man washes his hands before entering the main railway station to prevent the spread of coronavirus disease (COVID-19), in Nairobi, Kenya, March 17, 2020. REUTERS/Baz Ratner 

A man sits on a chair on the Promenade des Anglais in Nice as a lockdown imposed to slow the rate of the coronavirus disease (COVID-19) contagion started at midday in France, March 17, 2020. REUTERS/Eric Gaillard 

A closed playground is seen in a residential area to prevent the spread of coronavirus (COVID-19) disease, in Brussels, Belgium March 17, 2020. REUTERS/Francois Lenoir 

A commuter wearing protective gloves stands in Waterloo station during rush hour, as the number of Coronavirus cases grow around the world, in London, Britain, March 17, 2020. REUTERS/Hannah McKay 

People look out to sea in Blackpool as the number of coronavirus cases grow around the world, in Blackpool, Britain, March 17, 2020. REUTERS/Carl Recine 

A poll worker is seen outside a polling station during the Democratic presidential primary election in Miami, Florida, U.S. March 17, 2020. REUTERS/Marco Bello 

A lone pedestrian crosses a street during what would normally be the morning rush after most businesses have required employees to work from home due to the global coronavirus pandemic in Washington, U.S., March 17, 2020. REUTERS/Joshua Roberts 

Swings are seen at the beach in Ashkelon, Israel March 17, 2020. REUTERS/Amir Cohen 

Empty wardrobes are seen in a kindergarten as schools and kindergartens are closed due to the coronavirus disease (COVID-19) concerns in Cologne, Germany, March 17, 2020. REUTERS/Thilo Schmuelgen 

Rubber boots are seen in a kindergarten as schools and kindergartens are closed due to the coronavirus disease (COVID-19) concerns in Cologne, Germany, March 17, 2020. REUTERS/Thilo Schmuelgen 

A box with toys is seen in a kindergarten as schools and kindergartens are closed due to the coronavirus disease (COVID-19) concerns in Cologne, Germany, March 17, 2020. REUTERS/Thilo Schmuelgen 

Taxis are pictured at the main bus station during the outbreak of the coronavirus disease (COVID-19) in Berlin, Germany, March 17, 2020. REUTERS/Fabrizio Bensch 

A poll worker wearing protective gloves waits for voters during the Democratic presidential primary election at a polling center inside a fire station in the Coral Gables neighbourhood in Miami, Florida, U.S. March 17, 2020. REUTERS/Marco Bello