JOHANNESBURG – African nations came out swinging on the third day of the United Nations annual gathering of world leaders Thursday, calling for dramatic fiscal measures to help economies survive the coronavirus pandemic — which one leader called the “fifth horseman of the apocalypse.”African countries estimate they need $100 billion in support annually for the next three years, pointing out it’s a fraction of the trillions of dollars some richer countries are using to revive their economies.Debt cancellation is needed to free up more resources to tackle the virus and its effects, including the fight against other deadly diseases like malaria and HIV, heads of state said.“We need to purely and simply cancel this debt,” said Niger’s.