Unicef health consultant Hadiza Waya immunises a child during a vaccination campaign against polio at Hotoro-Kudu, Nassarawa district of Kano in northwest Nigeria. The World Health Organization said116mn children are to receive polio vaccines in 13 countries in west and central Africa as part of efforts to eradicate the disease on the continent. “The synchronised vaccination campaign, one of the largest of its kind ever implemented in Africa, is part of urgent measures to permanently stop polio on the continent,” the WHO said.
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