It was the success of the Salk Vaccine.
Polio epidemic
There are still cases of polio out there today, so we have the vaccinations if someday we were to have another breakout of the epidemic!
The first Polio epidemic was in 1894 in Vermont with 132 cases of it.
Yes
polio
5000
poor hygiene. airborne sneezes and coughs
A polio vaccine was invented in 1954. Each year after that, the number of polio cases decreased. By 1974, only 5 cases occurred. These were all people who were linked to the polio vaccine.
If that disease is not contained and stopped, it could become an epidemic.
In the 1930's there was an epidemic of polio. There was also influenza.
it was spread by airborne viruses sneezing coughing and by poor hygiene
The answer depends on whether you want the ratio of people in the US with polio compared to people with polio in the rest of the world (or the whole world), or the compared to people without polio in the US.