what is polio caused by
Causes of Polio: Poliovirus. Poliovirus is a very contagious virus that can spread easily from person to person. In fact, when a person is infected with poliovirus, it is expected that polio transmission among susceptible household contacts will occur in nearly 100 percent of children and over 90 percent of adults. person who is infected with polio can spread polio about 7-10 days before symptoms begin. A person can continue to spread polio for about three to six weeks after the beginning of polio symptoms. However, a person is most contagious for the 7-10 days after symptoms of polio have begun.