Infected countries
Polio remains endemic in four countries – Afghanistan, India, Nigeria and Pakistan – with a further four countries known to have (Angola, Chad and Democratic Republic of the Congo) or suspected of having (Sudan) re-established transmission of poliovirus. Several more countries had ongoing outbreaks in 2010 due to importations of poliovirus.
National Immunization Day calendar
Use this interactive calendar to see all planned supplementary immunization campaigns in countries.
National Immunization Day calendar The calendar is updated on a weekly basis. Please note that dates are not always accurate, since they are often finalized just before the activity.
Endemic countries
Polio-endemic countries have never stopped transmission of wild poliovirus.
Countries with re-established transmission
Countries with re-established transmission have active and persistent poliovirus transmission of more than 12 months following an importation.
Countries with imported poliovirus
Countries with imported poliovirus are experiencing ongoing outbreaks following an importation.