About Polio Virus

Poliovirus is a highly contagious human virus which attacks the nerve tissues in the brain and spinal cord. The virus is a single-stranded RNA virus from the family Picornaviridae and genus enterovirus. The poliovirus (PV) lives in the throat and intestinal tract. There are three subtypes of polio (type 1, 2 and 3) and many strains of each type; type 1 is the most virulent and common.
Polio can be spread by a number of ways.  The virus enters through the mouth and multiplies in the throat and gastrointestinal tract then moves into the bloodstream and is carried to the central nervous system where it replicates and destroys the motor neuron cells.