ALEXIS AKWAGYIRAM and ANGELA UKOMADI  NIGERIAN Gbemisola Ijigbamigbe's right leg was virtually paralysed after she contracted wild polio aged 11 months. Now the 28-year-old leads an active life as a wheelchair basketball player and also enjoys swimming and kayaking. "Polio is not a death sentence," she told Reuters, smiling. Thousands of people across Africa still live with the effects of the disease, but the World Health Organization (WHO) has declare the region free of endemic wild polio, four years after the last case was recorded in Nigeria. Health officials are set to announce that all 47 countries in the WHO's…