On this edition of Africa 54, gunmen in Nigeria release all 279 girls kidnapped from a boarding school in northwest state of Zamfara; The new chief of the World Trade Organization urges its member states to work with pharmaceutical companies to license more COVID-19 vaccine manufacturing in developing countries in order to triple global production; Three new cases of Ebola are confirmed in eastern Democratic Republic of Congo, bringing the total number of cases to 11 since authorities declared a resurgence of the virus last month.