The World Health Organization says Zambia has reported its first local case of polio since 1995, in a 2-year-old boy paralyzed by a virus derived from the vaccine.
In a report this week, WHO said the case was detected on the border with Congo, which has reported 37 cases of polio traced to the vaccine this year.
The UN health agency said there is no established link between the Zambia case and the Congo outbreak but said increased surveillance and vaccination efforts are needed, warning that "there is a potential for international spread."
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