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Kenya recorded it first polio case infection in 20 years in 2009, after a four-year-old girl was diagnosed with the disease along the country’s remote border with Sudan.

Polio is an infectious disease that mainly strikes children under five. It causes paralysis and can be fatal.

In 2006, two refugees escaping the war in Somalia were diagnosed with the disease at the Dadaab refugee camp at Kenya’s eastern border with Somalia. That outbreak was contained before it spread.

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Tom Odula in Nairobi, Kenya, and Katharine Houreld in Liboi contributed to this report.