Polio was not discovered to be contagious until 1905, there was approximately 60,000 cases of polio in the USA until 1955 when the vaccine was created. There was about 3,200 deaths per year until the vaccine was created. Now the amount of deaths from polio has decreased to below 100 a year.
Polio infects a person's brain and spinal cord and potentially can kill and paralyze the victim. It is a contagious disease caused by the polio virus.
The polio vaccine(ivp) produces antibodies for all 3 types of the polio virus, it is a dead vaccine. It triggers both t and b cell responses.