Brazil authorizes Butanvac vaccine for volunteers in clinical trial

Brazilian health regulator Anvisa on Wednesday gave the go-ahead for the Butanvac COVID-19 vaccine developed by Sao Paulo's Butantan Institute biomedical center to be used on volunteers in clinical trials. Anvisa in a statement said the vaccine will be applied in two doses, 28 days apart. Phase I of Butanvac's clinical trial will involve 400 volunteers, and the first two phases are expected to involve 6,000 volunteers in total.