Rare Vaccine-Derived Polio Discovered in 2 Countries Rare Vaccine-Derived Polio Discovered in 2 Countries Cases of paralysis caused by mutating polio vaccine have been found in South Sudan and Madagascar, the World Health Organization said Friday. http://ift.tt/118jiaG Poliomyelitis, Vaccination and Immunization Poliomyelitis, Vaccination and Immunization

By DONALD G. McNEIL Jr. from NYT World http://ift.tt/118jiaG

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