A volunteer for AstraZeneca and Oxford University’s coronavirus vaccine trial has died, Brazilian authorities said on Wednesday, according to Reuters. It was not immediately clear whether the man received the vaccine or had been part of a placebo group.
The Wall Street Journal cited local reports in Brazil as saying the volunteer was a man in his 20s from Rio de Janeiro.
Brazil health officials said an investigation into the death is ongoing, but the trial will continue.
Reuters quoted an anonymous source as saying that if the victim had received the vaccine, the trial would have been stopped.
Brazil has reported 5.2 million cases of coronavirus and the second highest number of coronavirus related deaths in the world after the United States.
Last June, Brazilian authorities announced a deal to purchase 100 million doses of the potential coronavirus vaccine should it prove to be safe and effective.
The country’s President Jair Bolsonaro, himself contracted coronavirus around the same time and recovered.