No child deaths definitively linked to Covid shots, FDA says (nbcnews.com)

Someone is about to get fired.

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What do they even mean by this? “There’s not a way to be certain, unless we found some specific marker for the vaccine”

I imagine they haven't found a "marker" because they haven't looked for one. Also haven't found one for anything else

Healthy child takes vaccine / get myocarditis soon after / dies... / vaccine is known to cause myocarditis

It's not definitive, but it's probably a better explanation than the rest. Unless the virus or some other condition come forward and confess