African states, including the continent’s biggest economy Nigeria, on Wednesday said they had begun to introduce measures aimed at stopping the spread of the new coronavirus. No verified infection has been reported to date in sub-Saharan Africa, but elsewhere countries have stopped flights to China and airlifted their citizens out of the area where the virus emerged. People arriving from China or any country with a “major outbreak” of the disease are advised to stay at home for at least two weeks if they develop any symptoms, according to the advisory issued by Health Minister Osagie Ehanire.