Wild polio remains endemic in Afghanistan and Pakistan; both countries are also struggling to contain outbreaks of vaccine-derived polio. Source: Vaccine-derived polio spreads in Africa after defeat of wild virus | Global development | The Guardian
Wild polio remains endemic in Afghanistan and Pakistan; both countries are also struggling to contain outbreaks of vaccine-derived polio. Source: Vaccine-derived polio spreads in Africa after defeat of wild virus | Global development | The Guardian