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On Monday, WHO warned that the risk of further spread of the vaccine-derived polio across central Africa and the Horn of Africa was “high,” noting the large-scale population movements in the region. More than a dozen African countries are currently battling outbreaks of polio caused by the virus, including Angola, Congo, Nigeria and Zambia. Amid the coronavirus pandemic, many of the large-scale vaccination campaigns needed to stamp out polio have been disrupted across Africa and elsewhere, ...