"Sir Falchi" ?
But, you can probably remember back when the Vaccine for Polio was rolled out. Lot's of folks thought that was the end of it, but then a few years later they came out with the "Sabin Vaccine" Fortunately, that was oral, so nt too big a deal.
Medicine has a way of changing with the times, trying to keep up with the bugs.
There has been some discussion going on for the last year or so about where we were going , long term, with this virus. It was suggested back in February that we could be looking at something like the Flu shots program. And with so many people refusing to take part in the vax programs, the bug will continue to mutate as it makes its way through the population.
And, an aside:
Look how long it took them to nail down Smallpox.