Is there another vaccine a person had to take 3 times that isn’t effective?
The recommended sequence for polio is four shots, but like the Covid vaccines it's effective.
airborne wrote: “Is there another vaccine a person had to take 3 times that isn’t effective?”
Can you name three vaccines that do not require boosters to maintain effectiveness?
Seriously, all the complaints advanced by the anti-vaxxers against the COVID vaccines apply to almost all other vaccines as well.
Then there is the ‘why take a vaccines to prevent an illness with a 99.5% survival rate’. What is the survival rate for polio? It’s 99%, but that doesn’t seem to matter to the anti-vaxxer cult.