“WHO and UNICEF said in a joint statement the polio outbreak in the Philippines is concerning because it is caused by vaccine-derived poliovirus type 2.
The weakened virus used in vaccines replicates for a short time in children’s intestines and is excreted in their feces. In rare instances, they said, the weakened virus can strengthen in areas with poor sanitation and hygiene. Children who have not been properly immunized can be susceptible.”
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