Outbreak of infantile paralysis
Two types of the polio virus is identified
Polio epidemic in New York accelerates research on how polio is spread
The USA establishes National Foundation for Infantile Paralysis, a fund-raising organisation focusing on polio research
Dr Jonas Stark develops the first polio vaccine
Dr Albert Sabin develops an oral vaccine against polio
The World Health Assembly create the Expanded Programme on Immunization to bring vaccines to the world’s children
First and largest internationally coordinated private-sector support of a public health initiative, with an initial pledge of US $120 million
The World Health Assembly passes a resolution to eradicate polio by 2000
More than 400 million children are immunized in 27 countries.
More than 56 million children are vaccinated in 19 countries.
The WHO Western Pacific Region is certified polio free. Almost one tenth of the world population receive the polio oral vaccine.
A new outbreak spreads from Nigeria to Western Africa. Polio eradication become the World Health Organisation's number one priority
Outbreaks in Central Africa Republic, Guinea, Kenya and Cote d'lvoire
the last case of wild poliovirus is reported in India
The last case of poliovirus type 3 is recorded in Nigeria in November
The globally synchronised switch from trivalent to bivalent oral poliovirus is implemented in April 2015. This is the first part of the phased withdrawal of all oral polio vaccine.