He had a cheeseburger the day before. Wonder which killed him.
Since you addressed your reply to me, I must point out that I was merely correcting a post by Melian, who is a great poster on these threads, as are you. As for your premise that it might be a cheeseburger, it is far more believable if the vaccine were administered 2 weeks plus before, than if two days before. With only 2 days, I'd definitely go with the vaccine. With 2 weeks plus it's more of a tossup, which is why I corrected Melian.
If you two want to fight over what killed him, at least having the facts might help your argument.