Bill Gates said Wednesday that "with any luck" polio will be eradicated by 2017 in the last two countries where it remains active, Pakistan and Afghanistan.

The Microsoft founder, who has donated billions to fight global diseases, was speaking in Doha at the official announcement of a $50 million donation from Qatar to "The Lives and Livelihood Fund".

This is a partnership fund between the Bill and Melinda Gates Foundation and the Islamic Development Bank (IDB), who together have been working to try to eradicate diseases, including polio, since 2012.

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