If it killed 5% of the people trying it, then you think they’d give it to 50,000+ volunteers while being closely watched by regulators? And you think 2,500 dying/being crippled by a new drug is something we wouldn’t hear about? 2,500 families and zero people blew the whistle?
What are the long term effects. The test and conclusions window is short. Even shorter because it is be rushed.
Have ever produced a vaccine like this type before?