World leaders have been urged to back a final push to eradicate polio.
British Prime Minister David Cameron joined Microsoft founder Bill Gates to announce big boosts in funding for the Global Polio Eradication Campaign.
The UK contribution, equivalent to 60 million dollars will pay for an extra 45 million vaccinations.
And Mr Gates’ foundation is to put another 100 million dollars into the project. Further support came from Abu Dhabi.
The announcements were made at the World Economic Forum in Davos, Switzerland. Some 700 million dollars is needed to complete the campaign.
The disease remains endemic in four countries: Afghanistan, India, Nigeria and Pakistan.
World Health Organisation general secretary Dr Margaret Chan said: "These new investments come at a critical time in the fight against polio.
"We have a window of opportunity now, with cases at an all time low. But if there is polio anywhere we are at risk of polio everywhere. Only eradication will ensure that polio does not reemerge as a global threat."
Mr Gates said: "Eradicating polio requires innovative thinking and political will, as well as funding from a range of donors, to support an aggressive programme that will get the job done."

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