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Wild poliovirus cases nearly doubled from 2012 to 2013, in part because the virus spread from the remaining 3 endemic counties to neighboring nations in Africa and the Middle East.
A recent study from the Centers for Disease Control and Prevention and the World Health Organization (WHO) showed that 8 countries reported 416 wild poliovirus cases in 2013, an 86% increase from the 223 cases that 5 countries reported in 2012. As of May 20, 2014, 82 cases were reported from 8 countries, compared with 34 cases from 3 countries during the same period last year (Moturi EK et al. MMWR Morb Mortal Wkly Rep. 2014;63:468-472).
Polio Outbreaks Slow Progress Toward Global Eradication. JAMA. 2014;312(5):479. doi:10.1001/jama.2014.8575
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