Researchers of the Rio de Janeiro State University (UERJ) walk in an alley after installing the equipment developed by Heitor Evangelista to collect sprays containing the new coronavirus in their droplets from the open-air sewage of the Santa Marta slum, as they work with the local volunteer sanitization team lead by Thiago Firmino during the outbreak of the coronavirus disease (COVID-19), in Rio de Janeiro, Brazil July 27, 2020. REUTERS/Ricardo Moraes TPX IMAGES OF THE DAY

Children are seen near the equipment developed by Heitor Evangelista and installed by him and his research group of the Rio de Janeiro State University (UERJ) to try to collect sprays containing the new coronavirus in their droplets from the air at the main entrance to the Santa Marta slum, as they work with the local volunteer sanitization team lead by Thiago Firmino during the outbreak of the coronavirus disease (COVID-19), in Rio de Janeiro, Brazil July 27, 2020. REUTERS/Ricardo Moraes

A woman washes her hands in a public sink at the entrance to the Santa Marta slum during the outbreak of the coronavirus disease (COVID-19), in Rio de Janeiro, Brazil July 27, 2020. REUTERS/Ricardo Moraes

A child flies a kite from the roof of a house at Santa Marta slum amid the outbreak of the coronavirus disease (COVID-19), in Rio de Janeiro, Brazil July 27, 2020. REUTERS/Ricardo Moraes

Children are seen next to the equipment developed by Heitor Evangelista and installed by him and his research group of the Rio de Janeiro State University (UERJ) to try to collect sprays containing the new coronavirus in their droplets from the air at the main entrance of the Santa Marta slum, as they work with the local volunteer sanitization team lead by Thiago Firmino during the outbreak of the coronavirus disease (COVID-19), in Rio de Janeiro, Brazil July 27, 2020. REUTERS/Ricardo Moraes

Heitor Evangelista and other researcher of the Rio de Janeiro State University (UERJ) prepare the equipment developed by him to try to collect sprays containing the new coronavirus in their droplets from the open-air sewage of the Santa Marta slum, as they work with the local volunteer sanitization team lead by Thiago Firmino during the outbreak of the coronavirus disease (COVID-19), in Rio de Janeiro, Brazil July 27, 2020. REUTERS/Ricardo Moraes

Residents walk near the equipment developed by Heitor Evangelista and installed by him and his research group of the Rio de Janeiro State University (UERJ) to try to collect sprays containing the new coronavirus in their droplets from the open-air sewage of the Santa Marta slum, as they work with the local volunteer sanitization team lead by Thiago Firmino during the outbreak of the coronavirus disease (COVID-19), in Rio de Janeiro, Brazil July 27, 2020. REUTERS/Ricardo Moraes

A resident walks next to the equipment developed by Heitor Evangelista and installed by him and his research group of the Rio de Janeiro State University (UERJ) to try to collect sprays containing the new coronavirus in their droplets from the air at the main entrance of the Santa Marta slum, as they work with the local volunteer sanitization team lead by Thiago Firmino during the outbreak of the coronavirus disease (COVID-19), in Rio de Janeiro, Brazil July 27, 2020. REUTERS/Ricardo Moraes

Heitor Evangelista and other researcher of the Rio de Janeiro State University (UERJ) prepare the equipment developed by him to try to collect sprays containing the new coronavirus in their droplets from the open-air sewage of the Santa Marta slum, as they work with the local volunteer sanitization team lead by Thiago Firmino during the outbreak of the coronavirus disease (COVID-19), in Rio de Janeiro, Brazil July 27, 2020. REUTERS/Ricardo Moraes

A researcher of the Rio de Janeiro State University (UERJ) prepares the equipment developed by Heitor Evangelista to try to collect sprays containing the new coronavirus in their droplets from the open-air sewage of the Santa Marta slum, as they work with the local volunteer sanitization team lead by Thiago Firmino during the outbreak of the coronavirus disease (COVID-19), in Rio de Janeiro, Brazil July 27, 2020. REUTERS/Ricardo Moraes

A researcher of the Rio de Janeiro State University (UERJ) prepares the equipment developed by Heitor Evangelista to try to collect sprays containing the new coronavirus in their droplets from the open-air sewage of the Santa Marta slum, as they work with the local volunteer sanitization team lead by Thiago Firmino during the outbreak of the coronavirus disease (COVID-19), in Rio de Janeiro, Brazil July 27, 2020. REUTERS/Ricardo Moraes

German Health Minister Jens Spahn and his counterparts Portugal's Marta Temido and Slovenia's Tomaz Gantar walk on the sidelines of a news conference following a videoconference with EU health ministers in Berlin, German July 16, 2020. Tobias Schwarz/Pool via REUTERS

German Health Minister Jens Spahn and his counterparts Portugal's Marta Temido and Slovenia's Tomaz Gantar hold a news conference following a videoconference with EU health ministers in Berlin, German July 16, 2020. Tobias Schwarz/Pool via REUTERS

German Health Minister Jens Spahn and his counterparts Portugal's Marta Temido and Slovenia's Tomaz Gantar hold a news conference following a videoconference with EU health ministers in Berlin, German July 16, 2020. Tobias Schwarz/Pool via REUTERS

Portugal's Health Minister Marta Temido takes part in a videoconference with EU health ministers in Berlin, German July 16, 2020. Tobias Schwarz/Pool via REUTERS

German Health Minister Jens Spahn and his counterparts Portugal's Marta Temido and Slovenia's Tomaz Gantar take part in a videoconference with EU health ministers in Berlin, German July 16, 2020. Tobias Schwarz/Pool via REUTERS

German Health Minister Jens Spahn and his counterparts Portugal's Marta Temido and Slovenia's Tomaz Gantar take part in a videoconference with EU health ministers in Berlin, German July 16, 2020. Tobias Schwarz/Pool via REUTERS

German Health Minister Jens Spahn and his counterparts Portugal's Marta Temido and Slovenia's Tomaz Gantar take part in a videoconference with EU health ministers in Berlin, German July 16, 2020. Tobias Schwarz/Pool via REUTERS

German Health Minister Jens Spahn and his counterparts Portugal's Marta Temido and Slovenia's Tomaz Gantar take part in a videoconference with EU health ministers in Berlin, German July 16, 2020. Tobias Schwarz/Pool via REUTERS

German Health Minister Jens Spahn and his counterparts Portugal's Marta Temido and Slovenia's Tomaz Gantar take part in a videoconference with EU health ministers in Berlin, German July 16, 2020. Tobias Schwarz/Pool via REUTERS

German Health Minister Jens Spahn and his counterparts Portugal's Marta Temido and Slovenia's Tomaz Gantar take part in a videoconference with EU health ministers in Berlin, German July 16, 2020. Tobias Schwarz/Pool via REUTERS

German Health Minister Jens Spahn and his counterparts Portugal's Marta Temido and Slovenia's Tomaz Gantar take part in a videoconference with EU health ministers in Berlin, German July 16, 2020. Tobias Schwarz/Pool via REUTERS

German Health Minister Jens Spahn speaks with his counterparts Portugal's Marta Temido and Slovenia's Tomaz Gantar before talks among EU health ministers in Berlin, German July 16, 2020. Tobias Schwarz/Pool via REUTERS

German Health Minister Jens Spahn speaks with his counterparts Portugal's Marta Temido and Slovenia's Tomaz Gantar before talks among EU health ministers in Berlin, German July 16, 2020. Tobias Schwarz/Pool via REUTERS

German Health Minister Jens Spahn speaks with his counterparts Portugal's Marta Temido and Slovenia's Tomaz Gantar before talks among EU health ministers in Berlin, German July 16, 2020. Tobias Schwarz/Pool via REUTERS

German Health Minister Jens Spahn speaks with his counterparts Portugal's Marta Temido and Slovenia's Tomaz Gantar before talks among EU health ministers in Berlin, German July 16, 2020. Tobias Schwarz/Pool via REUTERS

Sebastian Galleguillo, a paralympic swimmer who suffers from hearing loss, has lunch next to his father Edmundo Hernandez and his mother Marta Galleguillo, after a training session in the swimming pool his family built for him, during the outbreak of the coronavirus disease (COVID-19), in Florencio Varela, on the outskirts of Buenos Aires, Argentina July 13, 2020. Picture taken July 13, 2020. REUTERS/Agustin Marcarian

Salon owner Marta Zaczkowska works at the "Waxing Specialist" beauty salon, as restrictions are eased following the outbreak of the coronavirus disease (COVID-19), in Battersea district, in London, Britain July 13, 2020. REUTERS/Hannah McKay

Salon owner Marta Zaczkowska works at the "Waxing Specialist" beauty salon, as restrictions are eased following the outbreak of the coronavirus disease (COVID-19), in Battersea district, in London, Britain July 13, 2020. REUTERS/Hannah McKay

Salon owner Marta Zaczkowska works at the "Waxing Specialist" beauty salon, as restrictions are eased following the outbreak of the coronavirus disease (COVID-19), in Battersea district, in London, Britain July 13, 2020. REUTERS/Hannah McKay

Salon owner Marta Zaczkowska works at the "Waxing Specialist" beauty salon, as restrictions are eased following the outbreak of the coronavirus disease (COVID-19), in Battersea district, in London, Britain July 13, 2020. REUTERS/Hannah McKay

Salon owner Marta Zaczkowska works at the "Waxing Specialist" beauty salon, as restrictions are eased following the outbreak of the coronavirus disease (COVID-19), in Battersea district, in London, Britain July 13, 2020. REUTERS/Hannah McKay TPX IMAGES OF THE DAY

Salon owner Marta Zaczkowska works at the "Waxing Specialist" beauty salon, as restrictions are eased following the outbreak of the coronavirus disease (COVID-19), in Battersea district, in London, Britain July 13, 2020. REUTERS/Hannah McKay

Salon owner Marta Zaczkowska works at the "Waxing Specialist" beauty salon, as restrictions are eased following the outbreak of the coronavirus disease (COVID-19), in Battersea district, in London, Britain July 13, 2020. REUTERS/Hannah McKay

Salon owner Marta Zaczkowska works at the "Waxing Specialist" beauty salon in Battersea, as restrictions are eased following the outbreak of the coronavirus disease (COVID-19), in London, Britain July 13, 2020. REUTERS/Hannah McKay

Salon owner Marta Zaczkowska works at the "Waxing Specialist" beauty salon in Battersea, as restrictions are eased following the outbreak of the coronavirus disease (COVID-19), in London, Britain July 13, 2020. REUTERS/Hannah McKay

Marta Kulbaczewska, a visitor from Poland, poses for a picture at Hagia Sophia or Ayasofya, a UNESCO World Heritage Site, which was a Byzantine cathedral before being converted into a mosque and currently a museum, in Istanbul, Turkey, July 10, 2020. REUTERS/Murad Sezer

Rafa Aires from Spain, the father of newborn Marta who is unable to collect his daughter, speaks on the phone in the Hotel Venice owned by BioTexCom clinic in Kiev, Ukraine May 14, 2020. At least fifty babies born to surrogate mothers are stranded in a Ukrainian clinic as the coronavirus disease (COVID-19) lockdown prevents their foreign parents from collecting them. Picture taken May 14, 2020. REUTERS/Gleb Garanich

Rafa Aires from Spain, the father of newborn Marta who is unable to collect his daughter, speaks during an interview in the Hotel Venice owned by BioTexCom clinic in Kiev, Ukraine May 14, 2020. At least fifty babies born to surrogate mothers are stranded in a Ukrainian clinic as the coronavirus disease (COVID-19) lockdown prevents their foreign parents from collecting them. Picture taken May 14, 2020. REUTERS/Gleb Garanich

Dermatologist Marta Maria Moratinos treats patient Fernanda Zabala, holding a protective mask, at her clinic on the first day that some small businesses are allowed to open during lockdown, the coronavirus disease (COVID-19) outbreak in Madrid, Spain, May 4, 2020. "I feel thankful we have been allowed to open. I've had to ask for a personal loan to rescue the business" Moratinos said. REUTERS/Susana Vera

Dermatologist Marta Maria Moratinos wears protective gear as she does a skin check-up on Gonzalo Hurtado at her clinic, on the first day that some small businesses are allowed to open during lockdown, amid the coronavirus disease (COVID-19) outbreak in Madrid, Spain, May 4, 2020. "I feel thankful we have been allowed to open. I've had to ask for a personal loan to rescue the business" Moratinos said. REUTERS/Susana Vera

Maria Jose Garcia, 47, an intensive care unit nurse, poses for a portrait while being kissed by her son Cayetano (L), 12, and her daughter Marta,16, on Mother's Day along a street during a lockdown amid the coronavirus disease (COVID-19) outbreak, in Ronda, Spain, May 3, 2020. REUTERS/Jon Nazca

Resident Irma Wilson Clarke with Deputy Manager Marta Wcislo at Cumnor Hill House Care Home, following the outbreak of the coronavirus disease (COVID-19), Oxford, Britain, May 1, 2020. REUTERS/Eddie Keogh

Doctors, Marta Gravellone and Maeva Christophe prepare for a home visit, as the spread of the coronavirus disease (COVID-19) continues in Oleggio, Italy, April 23, 2020. REUTERS/Flavio Lo Scalzo

Doctor Marta Gravellone treats a patient at their home, as the spread of the coronavirus disease (COVID-19) continues in Oleggio, Italy, April 23, 2020. REUTERS/Flavio Lo Scalzo

Doctors, Marta Gravellone and Maeva Christophe prepare for a home visit, as the spread of coronavirus disease (COVID-19) continues in Oleggio, Italy, April 23, 2020. REUTERS/Flavio Lo Scalzo

Doctors, Marta Gravellone and Maeva Christophe treat a patient at their home, as the spread of coronavirus disease (COVID-19) continues in Oleggio, Italy, April 23, 2020. REUTERS/Flavio Lo Scalzo

Doctors, Marta Gravellone and Maeva Christophe prepare for a home visit, as the spread of coronavirus disease (COVID-19) continues in Oleggio, Italy, April 23, 2020. REUTERS/Flavio Lo Scalzo

Doctor Marta Gravellone, prepares for a home visit, as the spread of coronavirus disease (COVID-19) continues in Oleggio, Italy, April 23, 2020. REUTERS/Flavio Lo Scalzo

Doctors, Marta Gravellone and Maeva Christophe prepare for a home visit, as the spread of coronavirus disease (COVID-19) continues in Oleggio, Italy, April 23, 2020. REUTERS/Flavio Lo Scalzo

Doctors, Marta Gravellone and Maeva Christophe treat a patient at their home, as the spread of coronavirus disease (COVID-19) continues in Oleggio, Italy, April 23, 2020. REUTERS/Flavio Lo Scalzo

Doctors, Marta Gravellone and Maeva Christophe prepare for a home visit, as the spread of coronavirus disease (COVID-19) continues in Oleggio, Italy, April 23, 2020. REUTERS/Flavio Lo Scalzo

Doctors, Marta Gravellone and Maeva Christophe prepare for a home visit, as the spread of coronavirus disease (COVID-19) continues in Oleggio, Italy, April 23, 2020. REUTERS/Flavio Lo Scalzo

Doctors, Marta Gravellone and Maeva Christophe treat a patient at their home, as the spread of coronavirus disease (COVID-19) continues in Oleggio, Italy, April 23, 2020. REUTERS/Flavio Lo Scalzo

Doctors, Marta Gravellone and Maeva Christophe treat a patient at their home, as the spread of coronavirus disease (COVID-19) continues in Oleggio, Italy, April 23, 2020. REUTERS/Flavio Lo Scalzo

Doctors, Marta Gravellone and Maeva Christophe treat a patient at their home, as the spread of coronavirus disease (COVID-19) continues in Oleggio, Italy, April 23, 2020. REUTERS/Flavio Lo Scalzo

Doctors, Marta Gravellone and Maeva Christophe treat a patient at their home, as the spread of coronavirus disease (COVID-19) continues in Oleggio, Italy, April 23, 2020. REUTERS/Flavio Lo Scalzo

Doctors, Marta Gravellone and Maeva Christophe treat a patient at their home, as the spread of coronavirus disease (COVID-19) continues in Oleggio, Italy, April 23, 2020. REUTERS/Flavio Lo Scalzo

Doctors, Marta Gravellone and Maeva Christophe treat a patient at their home, as the spread of coronavirus disease (COVID-19) continues in Oleggio, Italy, April 23, 2020. REUTERS/Flavio Lo Scalzo

Doctors, Marta Gravellone and Maeva Christophe treat a patient at their home, as the spread of coronavirus disease (COVID-19) continues in Oleggio, Italy, April 23, 2020. REUTERS/Flavio Lo Scalzo