Due to an "adverse incident" that wasn't specified.
It is the first reported death since vaccine trials began.
The pandemic is still claiming lives in Asia, though on a smaller scale as countries have reacted much more quickly.
Brazil has the second-highest number of coronavirus cases and deaths after the US.
Local fishermen in Brazil found the carcass when they were walking through a mangrove forest.
Another footballing powerhouse leaves the competition in dramatic fashion.
The Red Devils' late winners saw them triumph over the Blue Samurai.