The 42 days is the standard period for declaring an outbreak over, twice the maximum 21-day incubation period of the virus.
According to a statement signed by the Director of Information in the Ministry of Health, Mrs. Ayotunde Adesugba, WHO will soon make the official declaration after Nigeria successfully curbed the virus which was imported into the country by Liberia-American, Patrick Sawyer, in July. The country recorded seven deaths in the process.