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In 2011, India, considered the most difficult place to achieve eradication, was declared polio-free.
WSJ: Bill Gates and Michael Bloomberg: Our Plan to Eradicate Polio
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The shootings, in a series of attacks, represent a major setback in the quest for a polio-free world.
BBC: Polio killings a major setback
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Infected travellers had carried the virus to nearly 20 previously polio-free countries causing more than 1200 polio cases.
BBC: Polio killings a major setback
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It will also risk the disease spreading beyond Pakistan's borders to India, which has been polio-free for more than a year.
BBC: Polio killings a major setback
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India has been polio-free for two years - a remarkable achievement.
BBC: Bill Gates: The world can defeat polio
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Iraq has been polio-free for more than two years, and it is not likely that the cultures in the incubators contained wild poliovirus, according to the report.
CNN: New purported Saddam tapes aired
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Somewhere today, in Nigeria, a child is polio-free, a mother is nursing a healthy baby, a family is free of malaria because a business or a civil society group decided to devote attention and resources to their health.
UN: Secretary-General