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 on July 27, 2020. (Photo by Ricardo Moraes/Reuters)
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