Covid-19 vaccine, which India has just authorized for emergency use.The Brazilian Association of Vaccine Clinics (ABCVAC) confirmed on its website it had signed a memorandum of understanding with the Indian firm to purchase its Covaxin vaccine, which is currently in the final stage of clinical trials.Any final deal would be subject to approval by Brazil's health regulator, Anvisa, which has yet to approve any vaccines against the new coronavirus.Also Read | A year on, China is shaking up the worldFar-right President Jair Bolsonaro's government faces mounting criticism of dragging its feet on a vaccination campaign in Brazil, which has the second-highest death toll in the pandemic, after the United States.That has left some state.