Vaccine-Derived Outbreak in Sudan

A fresh polio outbreak in Sudan was triggered by a vaccine-derived virus from Chad, WHO announced yesterday.
WHO declared Africa wild poliovirus-free last week—but that good news was tempered by the possibility of vaccine-derived outbreaks like this one. In rare cases, the live poliovirus used in the oral vaccine can mutate and trigger new outbreaks.


  • 2 recently vaccinated children in Sudan were paralyzed in March and April.  
  • WHO has identified 11 other cases though officials case numbers likely underestimate the scope of the outbreak. 
  • The virus has also been found in environmental samples.


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