Whether it's a matter of faulty detection, climatic factors or simple fluke, the remarkably low rate of coronavirus infection in African countries, with their fragile health systems, continues to puzzle – and worry – experts. To date, only three cases of infection have been officially recorded in Africa, one in Egypt, one in Algeria and one in Nigeria, with no deaths. This is a remarkably small number for a continent with nearly 1.3 billion inhabitants, and barely a drop in the ocean of more than 86,000 cases and nearly 3,000 deaths...