Bill Gates’ billions close to wiping out polio

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    Nigeria has been polio-free for a year thanks to a huge immunization campaign. But the fight against polio isn’t over.

    Bill Gates' billions close to wiping out polio

    Bill Gates' billions close to wiping out polio

    Bill Gates' billions close to wiping out polio

    Bill Gates' billions close to wiping out polioBill Gates' billions close to wiping out polioBill Gates' billions close to wiping out polio