I don't know if it was required, but when the covid stuff was being pumped by the media and for a few months I initially gave it a little credence, I asked my mother what I had received, which were, from memory, 3 - measles, mumps, rubella in the 70's. Don't know if it was required at that time though in the USA.
Outside of a tetanus shot many years later, I never got the flu vaccine or any other vaccine and have never suffered from any major disease.
Interesting you brought this up, as I'm currently pursuing through "The Black Death" - Manchester University Press - translated by Rosemary Horrox, which under subsection "Human Agency" lists the many accounts given that Jews were poisoning wells all over Europe, and a few Christians too, who were said to have been influenced by them. History (and I believe, reason) brushes these testimonies aside because of so called prejudice/anti-Semitism etc and the fact that these people were tortured to get confessions. I reject the first but see the reason in rejecting the latter - as torture is a poor way to get to the truth of the matter.
That being said, there was no internet at the time, nor telephones or any other modern communication. Letters had to be sent across lands that would take weeks to arrive - and the surprising thing about the confessions is that they were remarkably similar across many lands, pointing to specific Rabbis and places where poison was to be administered. Go figure eh.