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Director of the Butantan Institute, infectious disease specialist Esper Kallás, provides information on the progress of research into Butanvac, one of the 100% Brazilian vaccines under study against COVID-19. The statement was made in an interview with Canal Livre that will air this Sunday (4). The program is hosted by Rodolfo Schneider, with the participation of journalists Fernando Mitre, Márcio Campos and Cynthia Martins. Canal Livre will air at 8 pm on BandNews TV and at 11:30 pm on Band. More at: https://www.band.uol.com.br/