Kingbeowulf. Polio was already being eradicated via hygiene measures.  Also Polio disabilities are also the symptoms of other affects, like radiation damage, which was a new technology of the era and people got exposed to high levels.  The Polio epidemic was caused by many factors.  The Polio vaccine is definitely not the cause out of that disease.  The modern spread of Polio has been via Polio vaccines.  Do the research.

Measles was never consider dangerous during it being common, with people getting natural immunity and creating a better scenario than current.  You've probably heard of the Brady Bunch episode of having a measles party.  Well that was the go in that period.  People got it and got over it.  Near to zero issues and resulted in better outcomes of being naturally immune.

Vaccines are in themselves a danger and have caused many new conditions like Autism and SIDS, never experienced by most before 80's, before the vaccine regime.  1/54 births are now Autistic. Autism in communities that don't vaccinate are near to zero.