evidence: CDC recommends that children in the United States receive inactivated poliovirus vaccine (IPV) to protect against polio, or poliomyelitis, as part of their routine immunizations. IPV is given by injection in the leg or arm, depending on the person’s age. It can be given at the same time as other vaccines. Children get four doses of IPV, with one dose at each of these ages: [...] IPV doses administered in these countries and recorded as "IPV" should be assumed to be fractional IPV doses, not full IPV doses.