iVDPV= infective vaccine derived poliovirus

cVDPV= circulating vaccine derived poliovirus

aVDPV= ambiguous vaccine derived poliovirus

They are caused by a mutation regaining virulence in the attenuated poliovirus strains (Sabin 1-3) used for the oral poliomyelitis vaccine (OPV). Not sure of the specific difference between regressed strains though.

prevention consists of vaccination. There are two polio vaccines available; inactivated (Salk) poliovirus vaccine, and oral poliovirus vaccine.

Two polio vaccines are used throughout the world to combat poliomyelitis (or polio). The first was developed by Jonas Salk and first tested in 1952. Announced to the world by Salk on April 12, 1955, it consists of an injected dose of inactivated (dead) poliovirus. An oral vaccine was developed by Albert Sabin using attenuated poliovirus. Human trials of Sabin's vaccine began in 1957 and it was licensed in 1962.

Source: http://www.pbs.org/wgbh/aso/databank/entries/dm52sa.html

Poliomyelitis is the origanil name. polio is a viruse that is in the humman throught. and the first vaccine was introduced in 1955.

Polio is NOT hereditary. It is caused by a virus, poliovirus, that is highly contagious. A vaccine exists to prevent catching the disease.