And I understand the hesitancy. You just don't know if/when you may have an anaphylactic reaction to anything. I know as a young kid, we always used to go Jersey to get crabs. But at some point in my late teens, I casually had a crab cake and within an hour was completely covered in hives over my entire body. Months later, I tried just a tiny sliver of crab leg meat to see if it was the crab or something in that earlier crab cake - and again, severe reaction, although not as bad (had antihistamine at the ready). From that point on over 40 years later, I haven't touched (at least knowingly) any crab. I always mention it to doctors if asked and they assume I am allergic to other shellfish, which is not the case. One of these days I might be tempted to try again since I used to be allergic to dog/cat hair too and that went away thankfully by the time I was in my 30s.

It's just like the peanut allergies - you just don't know. The body is such a complex system and it all goes back to what is often said about getting vaccinated - "risk vs benefit".

And it's often helpful when you are immunized when you are younger and whether there was any adverse reactions at that point, and that would guide how vaccinations might be handled in the future. In some cases, I wouldn't put it past someone getting either a wrong vaccine or the wrong dose of it, which might have caused the body's overreaction and whether that is admitted by (or even known by) the person administering it. So all that is left out there is only "the vaccine cause a severe adverse reaction" without really knowing why and whether it was the wrong one, the wrong dose of it, or some underlying condition that was triggered - either by the vaccine or randomly at the time time of vaccination.