I think they gave different things to different groups of people. But regarding mRNA specifically: How do you control the dose when the antigen is produced by the cells of the patient after injection? Why did they change the formula of the vaccine after roll out but not start the safety testing over again? (Remember the vaccines needed to be in an ultra-cold freezer or they would spoil, but then later that was unnecessary.) How does age and immune function affect how much spike is produced? (Again, how do you dose the antigen?) These are questions that must be answered if safety matters. And what happens exactly when the epithilial cells that line your arteries and veins begin to produce foreign proteins? How does your immune system respond? What happens when there are rough spots in your circulatory system? What is with the foot long amyloid plaque blood clots found by morticians the world over? Why do both the virus and the vaccine affect so many different types of cells? They knew mRNA was dangerous in 2017. Where was the safety breakthrough? Surely there would be a big story about how they solved the safety issues...

STAT

Lavishly funded Moderna hits safety problems in bold bid to revolutionize medicine

Moderna Therapeutics, the most highly valued private company in biotech, has run into troubling safety problems with its most ambitious therapy, ST...

(Same link but archived)

STAT

Moderna hits safety problems in bold bid to reinvent medicine

Moderna Therapeutics, the most highly valued private company in biotech, has run into troubling safety problems with its most ambitious therapy, ST...