How Polio Is Spread throughout the world?Most people that are infected with poliovirus have no symptoms of illness and aren't aware that they have been infected. These people carry the virus in their intestines and can spread the infection to thousands of others around the world. The disease is easier to spread around the world if large amounts of the population have not had their vaccination. If a sufficient number of people are vaccinated, the virus is unable to spread and infect, so it eventually dies out.
|