Ana Paula Soares, 82, waits for the Sinovac CoronaVac coronavirus disease (COVID-19) vaccine at her home, as healthcare workers administer the vaccine to elderlies who cannot leave home, in the Rocinha slum in Rio de Janeiro, Brazil February 10, 2021. Picture taken February 10, 2021. REUTERS/Pilar Olivares

Healthcare workers carrying a cooler containing doses of Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine walk as they visit elderlies who cannot leave their homes, in the Turano slum in Rio de Janeiro, Brazil February 8, 2021. Picture taken February 8, 2021. REUTERS/Pilar Olivares

A healthcare worker administers Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine to a man at his home in the Turano slum in Rio de Janeiro, Brazil February 8, 2021. Picture taken February 8, 2021. REUTERS/Pilar Olivares TPX IMAGES OF THE DAY

A healthcare worker carrying a cooler containing doses of Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine, walks along an alley during a visit to elderlies who cannot leave their homes, in the Rocinha slum in Rio de Janeiro, Brazil February 12, 2021. REUTERS/Pilar Olivares

A healthcare worker administers Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine to a woman at her home in the Rocinha slum in Rio de Janeiro, Brazil February 10, 2021. Picture taken February 10, 2021. REUTERS/Pilar Olivares

Healthcare workers carrying a cooler containing doses of Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine, walk as they visit elderlies who cannot leave their homes, in the Rocinha slum in Rio de Janeiro, Brazil February 12, 2021. REUTERS/Pilar Olivares

Maria do Socorro Correia, 78, reacts after knowing she is going to receive Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine at her home, as healthcare workers administer the vaccine to elderlies who cannot leave home, in the Rocinha slum in Rio de Janeiro, Brazil February 10, 2021. Picture taken February 10, 2021. REUTERS/Pilar Olivares

Maria do Socorro Correia, 78, receives Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine at her home, as healthcare workers administer the vaccine to elderlies who cannot leave home, in the Rocinha slum in Rio de Janeiro, Brazil February 10, 2021. Picture taken February 10, 2021. REUTERS/Pilar Olivares

Zaquiel Augusto da Silva, 82, waits for Sinovac's CoronaVac coronavirus disease vaccine in his room, as healthcare workers administer the vaccine to the elderly who cannot leave home, in the Rocinha slum in Rio de Janeiro, Brazil February 12, 2021. REUTERS/Pilar Olivares TPX IMAGES OF THE DAY

Slums and high-rise buildings are seen in Mumbai, India, January 29, 2021. REUTERS/Francis Mascarenhas

A woman wearing a mask carries a child across a bridge in the Mathare slum, in Nairobi, Kenya, October 30, 2020. Picture taken October 30, 2020. REUTERS/Baz Ratner

A man walks past an advertisement for the OraQuick HIV self-testing kit, manufactured by Orasure Technologies, in the Mathare slum, in Nairobi, Kenya, October 30, 2020. Picture taken October 30, 2020. REUTERS/Baz Ratner

People cross a bridge in the Mathare slum, in Nairobi, Kenya, October 30, 2020. Picture taken October 30, 2020. REUTERS/Baz Ratner

Residents walk with the backdrop of the Mathare slum, in Nairobi, Kenya, October 30, 2020. Picture taken October 30, 2020. REUTERS/Baz Ratner

A staff member works on the projection of a movie during the Projeta Rocinha cultural project which projects movies, music clips and a health campaign on the rocks of Dois Irmaos mountain atop Rocinha slum amid the coronavirus disease (COVID-19) outbreak, in Rio de Janeiro, Brazil January 24, 2021. REUTERS/Ricardo Moraes

Lights of the projection of a movie are pictured during the Projeta Rocinha cultural project which projects movies, music clips and a health campaign on the rocks of Dois Irmaos mountain atop Rocinha slum amid the coronavirus disease (COVID-19) outbreak, in Rio de Janeiro, Brazil January 24, 2021. REUTERS/Ricardo Moraes

Residents watch a movie during the Projeta Rocinha cultural project which projects movies, music clips and a health campaign on the rocks of Dois Irmaos mountain atop Rocinha slum amid the coronavirus disease (COVID-19) outbreak, in Rio de Janeiro, Brazil January 24, 2021. REUTERS/Ricardo Moraes TPX IMAGES OF THE DAY

Residents watch a movie during the Projeta Rocinha cultural project which projects movies, music clips and a health campaign on the rocks of Dois Irmaos mountain atop Rocinha slum amid the coronavirus disease (COVID-19) outbreak, in Rio de Janeiro, Brazil January 24, 2021. REUTERS/Ricardo Moraes

A boy watches a movie during the Projeta Rocinha cultural project which projects movies, music clips and a health campaign on the rocks of Dois Irmaos mountain atop Rocinha slum amid the coronavirus disease (COVID-19) outbreak, in Rio de Janeiro, Brazil January 24, 2021. REUTERS/Ricardo Moraes

Boys watch a movie during the Projeta Rocinha cultural project which projects movies, music clips and a health campaign on the rocks of Dois Irmaos mountain atop Rocinha slum amid the coronavirus disease (COVID-19) outbreak, in Rio de Janeiro, Brazil January 24, 2021. REUTERS/Ricardo Moraes

A woman watches a movie during the Projeta Rocinha cultural project which projects movies, music clips and a health campaign on the rocks of Dois Irmaos mountain atop Rocinha slum amid the coronavirus disease (COVID-19) outbreak, in Rio de Janeiro, Brazil January 24, 2021. REUTERS/Ricardo Moraes TPX IMAGES OF THE DAY

Children queue for free food from a relief program amid the coronavirus disease (COVID-19) outbreak in a slum area in Manila, Philippines January 21, 2021. REUTERS/Eloisa Lopez

Children queue for free food from a relief program, amid the coronavirus disease (COVID-19) outbreak, in a slum area in Manila, Philippines January 21, 2021. REUTERS/Eloisa Lopez

Mumbai Monorail passes through a slum area on a smoggy morning in Mumbai, India, January 7, 2021. REUTERS/Niharika Kulkarni

Kids play soccer in Borel slum in Rio de Janeiro, Brazil, January 6, 2021. REUTERS/Ricardo Moraes

Revellers of the 'A Brilhante Estrela de Belem' Folia de Reis group take part in a traditional Epiphany celebration in Borel slum in Rio de Janeiro, Brazil, January 6, 2021. REUTERS/Ricardo Moraes

A reveller of the 'A Brilhante Estrela de Belem' Folia de Reis group takes part in a traditional Epiphany celebration in Borel slum in Rio de Janeiro, Brazil, January 6, 2021. REUTERS/Ricardo Moraes

Revellers of the 'A Brilhante Estrela de Belem' Folia de Reis group take part in a traditional Epiphany celebration in Borel slum in Rio de Janeiro, Brazil, January 6, 2021. REUTERS/Ricardo Moraes

A reveller of the 'A Brilhante Estrela de Belem' Folia de Reis group takes part in a traditional Epiphany celebration in Borel slum in Rio de Janeiro, Brazil, January 6, 2021. REUTERS/Ricardo Moraes

Revellers of the 'A Brilhante Estrela de Belem' Folia de Reis group, representing the Three Kings take part in a traditional Epiphany celebration in Borel slum in Rio de Janeiro, Brazil, January 6, 2021. REUTERS/Ricardo Moraes

Revellers of the 'A Brilhante Estrela de Belem' Folia de Reis group take part in a traditional Epiphany celebration in Borel slum in Rio de Janeiro, Brazil, January 6, 2021. REUTERS/Ricardo Moraes

Revellers of the 'A Brilhante Estrela de Belem' Folia de Reis group take part in a traditional Epiphany celebration in Borel slum in Rio de Janeiro, Brazil, January 6, 2021. REUTERS/Ricardo Moraes

A reveller of the 'A Brilhante Estrela de Belem' Folia de Reis group takes part in a traditional Epiphany celebration in Borel slum in Rio de Janeiro, Brazil, January 6, 2021. REUTERS/Ricardo Moraes

Revellers of the 'A Brilhante Estrela de Belem' Folia de Reis group take part in a traditional Epiphany celebration in Borel slum in Rio de Janeiro, Brazil, January 6, 2021. REUTERS/Ricardo Moraes

A reveller of the 'A Brilhante Estrela de Belem' Folia de Reis group takes part in a traditional Epiphany celebration in Borel slum in Rio de Janeiro, Brazil, January 6, 2021. REUTERS/Ricardo Moraes

Demonstrators attend a protest against the death of Marcelo Guimaraes, who according to residents was shot to death by police in an armored vehicle while riding a motorcycle next to Cidade de Deus slum, in Rio de Janeiro, Brazil January 5, 2021. The banner reads 'Murderous Police'. REUTERS/Ricardo Moraes

Relatives and friends of Marcelo Guimaraes, who according to residents was shot to death by police in an armored vehicle while riding a motorcycle next to Cidade de Deus slum, pose next to a graffiti art painted on his tribute during a protest against his death at the site where he was shot in Rio de Janeiro, Brazil January 5, 2021. REUTERS/Ricardo Moraes

Demonstrators attend a protest against the death of Marcelo Guimaraes, who according to residents was shot to death by police in an armored vehicle while riding a motorcycle next to Cidade de Deus slum, in Rio de Janeiro, Brazil January 5, 2021. REUTERS/Ricardo Moraes

Demonstrators attend a protest against the death of Marcelo Guimaraes, who according to residents was shot to death by police in an armored vehicle while riding a motorcycle next to Cidade de Deus slum, in Rio de Janeiro, Brazil January 5, 2021. REUTERS/Ricardo Moraes

Carla Roberta, widow of Marcelo Guimaraes, who according to residents was shot to death by police in an armored vehicle while riding a motorcycle next to Cidade de Deus slum, and their daughter Vitoria attend a protest against his death at the site where he was shot in Rio de Janeiro, Brazil January 5, 2021. REUTERS/Ricardo Moraes

Carla Roberta, widow of Marcelo Guimaraes, who according to residents was shot to death by police in an armored vehicle while riding a motorcycle next to Cidade de Deus slum, and their daughter Vitoria attend a protest against his death at the site where he was shot in Rio de Janeiro, Brazil January 5, 2021. REUTERS/Ricardo Moraes

Vitoria, daughter of Marcelo Guimaraes, who according to residents was shot to death by police in an armored vehicle while riding a motorcycle next to Cidade de Deus slum, kisses a graffiti art painted on his tribute during a protest against his death at the site where he was shot in Rio de Janeiro, Brazil January 5, 2021. REUTERS/Ricardo Moraes

Vitoria, daughter of Marcelo Guimaraes, who according to residents was shot to death by police in an armored vehicle while riding a motorcycle next to Cidade de Deus slum, poses next a graffiti art painted on his tribute during a protest against his death at the site where he was shot in Rio de Janeiro, Brazil January 5, 2021. REUTERS/Ricardo Moraes

Relatives and friends of Marcelo Guimaraes, who according to residents was shot to death by police in an armored vehicle while riding a motorcycle next to Cidade de Deus slum, attend his burial in Rio de Janeiro, Brazil January 5, 2021. REUTERS/Ricardo Moraes

Vitoria, daughter of Marcelo Guimaraes, who according to residents was shot to death by police in an armored vehicle while riding a motorcycle next to Cidade de Deus slum, mourns next to relatives and friends during his burial in Rio de Janeiro, Brazil January 5, 2021. REUTERS/Ricardo Moraes

Vitoria, daughter of Marcelo Guimaraes, who according to residents was shot to death by police in an armored vehicle while riding a motorcycle next to Cidade de Deus slum, mourns during his burial in Rio de Janeiro, Brazil January 5, 2021. REUTERS/Ricardo Moraes

Vitoria, daughter of Marcelo Guimaraes, who according to residents was shot to death by police in an armored vehicle while riding a motorcycle next to Cidade de Deus slum, mourns during his burial in Rio de Janeiro, Brazil January 5, 2021. REUTERS/Ricardo Moraes

Vitoria, daughter of Marcelo Guimaraes, who according to residents was shot to death by police in an armored vehicle while riding a motorcycle next to Cidade de Deus slum, mourns during his burial in Rio de Janeiro, Brazil January 5, 2021. The banner reads "The bullet hits the Black, the poor, the worker". REUTERS/Ricardo Moraes

Carla Roberta, widow of Marcelo Guimaraes, who according to residents was shot to death by police in an armored vehicle while riding a motorcycle next to Cidade de Deus slum, faints as her daughter Vitoria mourns during his burial in Rio de Janeiro, Brazil January 5, 2021. REUTERS/Ricardo Moraes

Carla Roberta, widow of Marcelo Guimaraes, who according to residents was shot to death by police in an armored vehicle while riding a motorcycle next to Cidade de Deus slum, faints during his burial in Rio de Janeiro, Brazil January 5, 2021. REUTERS/Ricardo Moraes

Carla Roberta, widow of Marcelo Guimaraes, who according to residents was shot to death by police in an armored vehicle while riding a motorcycle next to Cidade de Deus slum, faints as her daughter Vitoria mourns during his burial in Rio de Janeiro, Brazil January 5, 2021. REUTERS/Ricardo Moraes

A worker checks the temperature of schoolchildren before entering the Olympic Primary School during the reopening of schools, after the government closed learning institutions due to the coronavirus disease (COVID-19) outbreak, in Kibera slums of Nairobi, Kenya January 4, 2021. REUTERS/Thomas Mukoya

A worker checks the temperature of schoolchildren before entering the Olympic Primary School during the reopening of schools, after the government closed learning institutions due to the coronavirus disease (COVID-19) outbreak, in Kibera slums of Nairobi, Kenya January 4, 2021. REUTERS/Thomas Mukoya

Schoolchildren queue to have their temperature checked before entering the Olympic Primary School during the reopening of schools, after the government closed learning institutions due to the coronavirus disease (COVID-19) outbreak, in Kibera slums of Nairobi, Kenya January 4, 2021. REUTERS/Thomas Mukoya

Schoolchildren have their temperature checked before entering the Olympic Primary School during the reopening of schools, after the government closed learning institutions due to the coronavirus disease (COVID-19) outbreak, in Kibera slums of Nairobi, Kenya January 4, 2021. REUTERS/Thomas Mukoya

Schoolchildren queue to have their temperature checked before entering the Olympic Primary School during the reopening of schools, after the government closed learning institutions due to the coronavirus disease (COVID-19) outbreak, in Kibera slums of Nairobi, Kenya January 4, 2021. REUTERS/Thomas Mukoya

Schoolchildren are seen reflected in a puddle as they queue to have their temperature checked before entering the Olympic Primary School during the reopening of schools, after the government closed learning institutions due to the coronavirus disease (COVID-19) outbreak, in Kibera slums of Nairobi, Kenya January 4, 2021. REUTERS/Thomas Mukoya TPX IMAGES OF THE DAY

Schoolchildren queue to have their temperature checked before entering the Olympic Primary School during the reopening of schools, after the government closed learning institutions due to the coronavirus disease (COVID-19) outbreak, in Kibera slums of Nairobi, Kenya January 4, 2021. REUTERS/Thomas Mukoya

A schoolboy walks along the Kenya-Uganda railway line during the reopening of schools, after the government closed learning institutions due to the coronavirus disease (COVID-19) outbreak, in Kibera slums of Nairobi, Kenya January 4, 2021. REUTERS/Thomas Mukoya

Schoolchildren queue to have their temperature checked before entering the Olympic Primary School during the reopening of schools, after the government closed learning institutions due to the coronavirus disease (COVID-19) outbreak, in Kibera slums of Nairobi, Kenya January 4, 2021. REUTERS/Thomas Mukoya