I was just recently corrected, I thought an uncle (through marriage) was going in for a minor heart surgery got the shot and at the final checkup realized he needed a quadruple bypass. I was wrong.

He actually cheated the line somehow to get the shot, older guy early retirement with no significant heart issues. He felt funny one day and the diagnosis was to get a heart stint (whatever it's called) and needed a quadruple bypass after all.

His wife is a nutritionist, so, no matter what we said she would have got that whole branch vaccinated asap.