A handout photo made available by the Lagos State Ministry of Health shows health workers working in a quarantined area of the Infectious Disease Hospital in Yaba, Lagos, Nigeria, 27 February 2020. (Photo: EPA-EFE/LAGOS STATE MINISTRY OF HEALTH) 
The Italian man, who authorities said arrived in Nigeria from Milan on the evening of Feb. 24, did not have symptoms when the plane landed.
Authorities are now working to "meet and observe" all those who were on the flight with him, and are also identifying all the people he met and places he visited in Lagos, a city of some 20 million people, before reporting to the hospital. (Reporting By Camillus Eboh and Abraham Achirga in Abuja, writing by Libby George; Editing by Alison Williams)