Gee, for something that's been around for decades. Sure seems like there's a lot they don't know.
If you don't even bother to look for it ,
then you'll never find it.
In the scientific world, that 'bother to look for it' is called research.
So, in a nutshell, they haven't even been bothered to look for the side effects of the 'jab' during an autopsy of a vaccinated recipient who died,
to determine the actual cause of death.
Also, they haven't been bothered to view the reports of the official CDC VAERS website (side effects).