Is this a spoof, a hoax?
Six dead in Pfizer late-stage trial. I do not have an original document confirming this.
Just https://thenewdaily.com.au/news/coronavirus/2020/12/09/pfizer-oxford-astrazeneca-vaccines/

FDA reveals six deaths in Pfizer trial but says not to worry
Six people died in Pfizer’s late-stage trial of the coronavirus vaccine, the US Food and Drug Administration has revealed.
thenewdaily.com.au