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Study Reveals Chink in Polio Vaccine’s Armor

A mutated polio virus that slipped through vaccine defenses caused an unusually lethal outbreak in the Republic of Congo in 2010, according to a new study.  An intensive vaccination campaign was able to stop the virus.  But the authors say their research shows new and dangerous strains may emerge as polio eradication nears, and high rates of vaccination are the best available protection. Weaker vaccine Polio usually paralyzes its victims. It is not typically...

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