On Sunday, May 11, the World Health Organization reported the investigation of a possible wild poliovirus type 1 (WPV1) case in Somalia's Banadir region.
A 32-month-old girl had become ill due to acute flaccid paralysis (AFP – essentially, muscle weakness or paralysis) on April 18, and preliminary lab tests indicate WPV1. While other diseases and conditions can cause AFP, they are rare (about 1 case per 100,000 children under 15). Therefore, surveillance of cases of AFP is an important tool in polio surveillance.
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