A couple walks a dog near cows in Midsummer Common park, in Cambridge, Britain July 2, 2020. REUTERS/Andrew Couldridge

A woman cycles past cows in Midsummer Common park, in Cambridge, Britain July 2, 2020. REUTERS/Andrew Couldridge

A woman cycles past cows in Midsummer Common park, in Cambridge, Britain July 2, 2020. REUTERS/Andrew Couldridge

A man reacts as he stands next to a cow outside the Fort St George pub in Midsummer Common park, in Cambridge, Britain July 2, 2020. REUTERS/Andrew Couldridge

A woman wearing a protective mask rides on a bicycle past a cow in Midsummer Common park, in Cambridge, Britain July 2, 2020. REUTERS/Andrew Couldridge

A man jogs past cows in Midsummer Common park, in Cambridge, Britain July 2, 2020. REUTERS/Andrew Couldridge

A woman takes a picture of cows in Midsummer Common park, in Cambridge, Britain July 2, 2020. REUTERS/Andrew Couldridge

A man looks at his phone as he walks past a cow in Midsummer Common park, in Cambridge, Britain July 2, 2020. REUTERS/Andrew Couldridge

Dyson design engineer Jessica Rowley examines pollution data gathered by a special backpack designed to monitor air quality during the COVID-19 lockdown on Clapham Common, London, Britain June 29, 2020. Picture taken June 29, 2020. REUTERS/Stuart McDill

A badge on a backpack designed to monitor pollution during the COVID-19 lockdown reads "I'm an Air Quality Scientist" as Dyson design engineer Jessica Rowley examines data on her laptop on Clapham Common, London, Britain June 29, 2020. Picture taken June 29, 2020. REUTERS/Stuart McDill

A badge on a backpack designed to monitor pollution during the COVID-19 lockdown reads "I'm an Air Quality Scientist" as Dyson design engineer Jessica Rowley examines data on her laptop on Clapham Common, London, Britain June 29, 2020. Picture taken June 29, 2020. REUTERS/Stuart McDill

A badge is seen on a special backpack designed to monitor pollution during the COVID-19 lockdown on Clapham Common, London, Britain June 29, 2020. Picture taken June 29, 2020. REUTERS/Stuart McDill

Actor and rapper Common joins protestors who gather following the death of Breonna Taylor and many other Black people, at the Capitol in Frankfort, Kentucky, U.S. June 25, 2020. REUTERS/Bryan Woolston

French medicine professor Didier Raoult, who has promoted a combination of hydroxychloroquine, an antimalarial drug, and azithromycin, a common antibiotic, as a remedy for the coronavirus disease (COVID-19), wears a protective face mask as he arrives to attend a hearing at the National Assembly in Paris, France, June 24, 2020. At R, Member of Parliament Eric Ciotti. REUTERS/Gonzalo Fuentes

French medicine professor Didier Raoult, who has promoted a combination of hydroxychloroquine, an antimalarial drug, and azithromycin, a common antibiotic, as a remedy for the coronavirus disease (COVID-19), is surrounded by journalists as he arrives to attend a hearing at the National Assembly in Paris, France, June 24, 2020. REUTERS/Gonzalo Fuentes

French medicine professor Didier Raoult, who has promoted a combination of hydroxychloroquine, an antimalarial drug, and azithromycin, a common antibiotic, as a remedy for the coronavirus disease (COVID-19), arrives to attend a hearing at the National Assembly in Paris, France, June 24, 2020. REUTERS/Gonzalo Fuentes

French medicine professor Didier Raoult, who has promoted a combination of hydroxychloroquine, an antimalarial drug, and azithromycin, a common antibiotic, as a remedy for the coronavirus disease (COVID-19), arrives to attend a hearing at the National Assembly in Paris, France, June 24, 2020. REUTERS/Gonzalo Fuentes

French medicine professor Didier Raoult, who has promoted a combination of hydroxychloroquine, an antimalarial drug, and azithromycin, a common antibiotic, as a remedy for the coronavirus disease (COVID-19), arrives to attend a hearing at the National Assembly in Paris, France, June 24, 2020. REUTERS/Gonzalo Fuentes

French medicine professor Didier Raoult, who has promoted a combination of hydroxychloroquine, an antimalarial drug, and azithromycin, a common antibiotic, as a remedy for the coronavirus disease (COVID-19), arrives to attend a hearing at the National Assembly in Paris, France, June 24, 2020. REUTERS/Gonzalo Fuentes

French medicine professor Didier Raoult, who has promoted a combination of hydroxychloroquine, an antimalarial drug, and azithromycin, a common antibiotic, as a remedy for the coronavirus disease (COVID-19), is surrounded by journalists as he arrives to attend a hearing at the National Assembly in Paris, France, June 24, 2020. REUTERS/Gonzalo Fuentes

French medicine professor Didier Raoult, who has promoted a combination of hydroxychloroquine, an antimalarial drug, and azithromycin, a common antibiotic, as a remedy for the coronavirus disease (COVID-19), is surrounded by journalists as he arrives to attend a hearing at the National Assembly in Paris, France, June 24, 2020. REUTERS/Gonzalo Fuentes

French medicine professor Didier Raoult, who has promoted a combination of hydroxychloroquine, an antimalarial drug, and azithromycin, a common antibiotic, as a remedy for the coronavirus disease (COVID-19), arrives to attend a hearing at the National Assembly in Paris, France, June 24, 2020. REUTERS/Gonzalo Fuentes

French medicine professor Didier Raoult, who has promoted a combination of hydroxychloroquine, an antimalarial drug, and azithromycin, a common antibiotic, as a remedy for the coronavirus disease (COVID-19), is surrounded by journalists as he arrives to attend a hearing at the National Assembly in Paris, France, June 24, 2020. REUTERS/Gonzalo Fuentes

French medicine professor Didier Raoult, who has promoted a combination of hydroxychloroquine, an antimalarial drug, and azithromycin, a common antibiotic, as a remedy for the coronavirus disease (COVID-19), wears a protective face mask as he arrives to attend a hearing at the National Assembly in Paris, France, June 24, 2020. At R, Member of Parliament Eric Ciotti. REUTERS/Gonzalo Fuentes

French medicine professor Didier Raoult, who has promoted a combination of hydroxychloroquine, an antimalarial drug, and azithromycin, a common antibiotic, as a remedy for the coronavirus disease (COVID-19), wears a protective face mask as he arrives to attend a hearing at the National Assembly in Paris, France, June 24, 2020. At R, Member of Parliament Eric Ciotti. REUTERS/Gonzalo Fuentes

French medicine professor Didier Raoult, who has promoted a combination of hydroxychloroquine, an antimalarial drug, and azithromycin, a common antibiotic, as a remedy for the coronavirus disease (COVID-19), wears a protective face mask as he arrives to attend a hearing at the National Assembly in Paris, France, June 24, 2020. At R, Member of Parliament Eric Ciotti. REUTERS/Gonzalo Fuentes

French medicine professor Didier Raoult, who has promoted a combination of hydroxychloroquine, an antimalarial drug, and azithromycin, a common antibiotic, as a remedy for the coronavirus disease (COVID-19), wears a protective face mask as he arrives to attend a hearing at the National Assembly in Paris, France, June 24, 2020. At R, Member of Parliament Eric Ciotti. REUTERS/Gonzalo Fuentes

People enjoy the hot weather in an inflatable pool on Clapham Common in London, Britain June 23, 2020. REUTERS/Hannah Mckay

People enjoy the hot weather in an inflatable pool on Clapham Common in London, Britain June 23, 2020. REUTERS/Hannah Mckay

People enjoy the hot weather in an inflatable pool on Clapham Common in London, Britain June 23, 2020. REUTERS/Hannah Mckay

People enjoy the hot weather in an inflatable pool on Clapham Common in London, Britain June 23, 2020. REUTERS/Hannah Mckay

People enjoy the hot weather in an inflatable pool on Clapham Common in London, Britain June 23, 2020. REUTERS/Hannah Mckay

People enjoy the hot weather in an inflatable pool on Clapham Common in London, Britain June 23, 2020. REUTERS/Hannah Mckay TPX IMAGES OF THE DAY

People cross the street between Kierland Commons and Scottsdale Quarter with and without face coverings, during the global outbreak of the coronavirus disease (COVID-19), in Scottsdale, Arizona, U.S. June 18, 2020. REUTERS/Courtney Pedroza

Canada's Conservative Party leader Andrew Scheer leaves after attending a sitting of the special committee on the coronavirus disease (COVID-19) outbreak at the House of Commons on Parliament Hill in Ottawa, Ontario, Canada June 18, 2020. REUTERS/Patrick Doyle

New Democratic Party leader Jagmeet Singh attends a sitting of the special committee on the coronavirus disease (COVID-19) outbreak at the House of Commons on Parliament Hill in Ottawa, Ontario, Canada June 18, 2020. REUTERS/Patrick Doyle

New Democratic Party leader Jagmeet Singh attends a sitting of the special committee on the coronavirus disease (COVID-19) outbreak at the House of Commons on Parliament Hill in Ottawa, Ontario, Canada June 18, 2020. REUTERS/Patrick Doyle

New Democratic Party leader Jagmeet Singh attends a sitting of the special committee on the coronavirus disease (COVID-19) outbreak at the House of Commons on Parliament Hill in Ottawa, Ontario, Canada June 18, 2020. REUTERS/Patrick Doyle

Bloc Quebecois MP Alain Therrien attends a sitting of the special committee on the coronavirus disease (COVID-19) outbreak at the House of Commons on Parliament Hill in Ottawa, Ontario, Canada June 18, 2020. REUTERS/Patrick Doyle

Bloc Quebecois MP Alain Therrien attends a sitting of the special committee on the coronavirus disease (COVID-19) outbreak at the House of Commons on Parliament Hill in Ottawa, Ontario, Canada June 18, 2020. REUTERS/Patrick Doyle

New Democratic Party leader Jagmeet Singh attends a sitting of the special committee on the coronavirus disease (COVID-19) outbreak at the House of Commons on Parliament Hill in Ottawa, Ontario, Canada June 18, 2020. REUTERS/Patrick Doyle

Canada's Prime Minister Justin Trudeau speaks during a sitting of the special committee on the coronavirus disease (COVID-19) outbreak at the House of Commons on Parliament Hill in Ottawa, Ontario, Canada June 18, 2020. REUTERS/Patrick Doyle

Canada's Conservative Party leader Andrew Scheer speaks during a sitting of the special committee on the coronavirus disease (COVID-19) outbreak at the House of Commons on Parliament Hill in Ottawa, Ontario, Canada June 18, 2020. REUTERS/Patrick Doyle

Canada's Prime Minister Justin Trudeau speaks during a sitting of the special committee on the coronavirus disease (COVID-19) outbreak at the House of Commons on Parliament Hill in Ottawa, Ontario, Canada June 18, 2020. REUTERS/Patrick Doyle

Canada's Conservative Party leader Andrew Scheer speaks during a sitting of the special committee on the coronavirus disease (COVID-19) outbreak at the House of Commons on Parliament Hill in Ottawa, Ontario, Canada June 18, 2020. REUTERS/Patrick Doyle

Canada's Minister of Public Safety and Emergency Preparedness Bill Blair speaks during a meeting of the special committee on the COVID-19 pandemic, as efforts continue to help slow the spread of the coronavirus disease (COVID-19), in the House of Commons on Parliament Hill in Ottawa, Ontario, Canada June 16, 2020. REUTERS/Blair Gable

Canada's Minister of Innovation, Science and Industry Navdeep Bains speaks during a meeting of the special committee on the COVID-19 pandemic, as efforts continue to help slow the spread of the coronavirus disease (COVID-19), in the House of Commons on Parliament Hill in Ottawa, Ontario, Canada June 16, 2020. REUTERS/Blair Gable

Canada's Minister of Families, Children and Social Development Ahmed Hussen speaks during a meeting of the special committee on the COVID-19 pandemic, as efforts continue to help slow the spread of the coronavirus disease (COVID-19), in the House of Commons on Parliament Hill in Ottawa, Ontario, Canada June 16, 2020. REUTERS/Blair Gable

Canada's Minister of Health Patty Hajdu speaks during a meeting of the special committee on the COVID-19 pandemic, as efforts continue to help slow the spread of the coronavirus disease (COVID-19), in the House of Commons on Parliament Hill in Ottawa, Ontario, Canada June 16, 2020. REUTERS/Blair Gable

Canada's Leader of the Government in the House of Commons Pablo Rodriguez speaks during a meeting of the special committee on the COVID-19 pandemic, as efforts continue to help slow the spread of the coronavirus disease (COVID-19), in the House of Commons on Parliament Hill in Ottawa, Ontario, Canada June 16, 2020. REUTERS/Blair Gable

Canada's Bloc Quebecois leader Yves-Francois Blanchet speaks during a meeting of the special committee on the COVID-19 pandemic, as efforts continue to help slow the spread of the coronavirus disease (COVID-19), in the House of Commons on Parliament Hill in Ottawa, Ontario, Canada June 16, 2020. REUTERS/Blair Gable

Canada's Prime Minister Justin Trudeau speaks during a meeting of the special committee on the COVID-19 pandemic, as efforts continue to help slow the spread of the coronavirus disease (COVID-19), in the House of Commons on Parliament Hill in Ottawa, Ontario, Canada June 16, 2020. REUTERS/Blair Gable

Canada's New Democratic Party leader Jagmeet Singh speaks during a meeting of the special committee on the COVID-19 pandemic, as efforts continue to help slow the spread of the coronavirus disease (COVID-19), in the House of Commons on Parliament Hill in Ottawa, Ontario, Canada June 16, 2020. REUTERS/Blair Gable

Canada's Prime Minister Justin Trudeau speaks during a meeting of the special committee on the COVID-19 pandemic, as efforts continue to help slow the spread of the coronavirus disease (COVID-19), in the House of Commons on Parliament Hill in Ottawa, Ontario, Canada June 16, 2020. REUTERS/Blair Gable

Canada's Conservative Party leader Andrew Scheer speaks during a meeting of the special committee on the COVID-19 pandemic, as efforts continue to help slow the spread of the coronavirus disease (COVID-19), in the House of Commons on Parliament Hill in Ottawa, Ontario, Canada June 16, 2020. REUTERS/Blair Gable

Canada's Prime Minister Justin Trudeau speaks during a meeting of the special committee on the COVID-19 pandemic, as efforts continue to help slow the spread of the coronavirus disease (COVID-19), in the House of Commons on Parliament Hill in Ottawa, Ontario, Canada June 16, 2020. REUTERS/Blair Gable

Canada's Prime Minister Justin Trudeau speaks during a meeting of the special committee on the COVID-19 pandemic, as efforts continue to help slow the spread of the coronavirus disease (COVID-19), in the House of Commons on Parliament Hill in Ottawa, Ontario, Canada June 16, 2020. REUTERS/Blair Gable

Britain's Leader of the House of Commons Jacob Rees-Mogg is seen queuing outside Parliament before voting on whether to end special coronavirus measures in Parliament, following the outbreak of the coronavirus disease (COVID-19), London, Britain, June 2, 2020. REUTERS/John Sibley

Britain's Leader of the House of Commons Jacob Rees-Mogg is seen queuing outside Parliament before voting on whether to end special coronavirus measures in Parliament, following the outbreak of the coronavirus disease (COVID-19), London, Britain, June 2, 2020. REUTERS/John Sibley

Britain's Leader of the House of Commons Jacob Rees-Mogg is seen queuing outside Parliament before voting on whether to end special coronavirus measures in Parliament, following the outbreak of the coronavirus disease (COVID-19), London, Britain, June 2, 2020. REUTERS/John Sibley