Gustavo Romero
Dr. Gustavo Romero, of University Hospital of Brasilia’s Nucleus of Tropical Medicine, presents to the press China’s Sinovac Biotech experimental vaccine for the new coronavirus before it is administered to volunteers in Brasilia, Brazil, Wednesday, Aug. 5, 2020. According to a statement from the University Hospital, 850 volunteers, including health professionals, will receive shots starting Wednesday as part of a study on whether the experimental vaccine works. (AP Photo/Eraldo Peres)
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