I seem to remember as a kid the Polio vaccine was a drop of liquid on a sugar cube and it only had to be taken once in your life....according to this article that’s not longer the case, did the polio vaccine change in the last 50 years or so, perhaps I’m wrong..
The polio vaccine was a true vaccine. The Miriam Webster online dictionary had to add an additional definition for the word “vaccine“ to make it cover this mRNA shot.
Only once. Nobody objected to the vaccinations. Everyone was terrified of the disease, as they should have been. So they were able to eradicate it.
Unfortunately, that kind of trust went out with the hula hoop.
The immunizations for infants / young children involve more than one booster shots to trigger permanent / long term immunity to things like measles, etc.