Editing Polio vaccine (section)

===Schedule===
[[File:Share of one-year-olds vaccinated against polio (Pol3), OWID.svg|thumb|upright=1.9|Share of one-year-olds vaccinated against polio in 2015<ref>{{cite web |title=Share of one-year-olds vaccinated against polio (Pol3) |url=https://ourworldindata.org/grapher/polio-vaccine-coverage-of-one-year-olds |website=Our World in Data |access-date=4 March 2020 |archive-date=22 February 2020 |archive-url=https://web.archive.org/web/20200222015955/https://ourworldindata.org/grapher/polio-vaccine-coverage-of-one-year-olds |url-status=live }}</ref>]]

In countries with endemic polio or where the risk of imported cases is high, the WHO recommends OPV vaccine at birth followed by a primary series of three OPV doses and at least one IPV dose starting at 6 weeks of age, with a minimum of 4 weeks between OPV doses. In countries with more than 90% immunization coverage and low risk of importation, the WHO recommends one or two IPV doses starting at two months of age followed by at least two OPV doses, with the doses separated by 4–8 weeks depending on the risk of exposure. In countries with the highest levels of coverage and the lowest risks of importation and transmission, the WHO recommends a primary series of three IPV injections, with a booster dose after an interval of six months or more if the first dose was administered before two months of age.<ref name="WHO2016" />