A polio outbreak spreading from Nigeria to neighbouring countries is putting 15-million children at risk and undermining efforts to eradicate the disease worldwide, the United Nations health agency said on Wednesday.
"Polio continues to spread within Nigeria to areas which were polio-free and also to neighbouring countries," said David Heymann, who leads the World Health Organisation's fight against the crippling illness.
Nearly a dozen children have being paralysed in Burkina Faso, Ghana, Niger and Togo, from the polio virus traced to northern Nigeria, said WHO.
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