Credit: Reuters/Umaru Fofana
Health workers carry the body of an Ebola virus victim in Kenema, Sierra Leone, June 25, 2014.
Nigeria, the latest country to import the disease, has had up to four cases, of which three are classed as 'probable' Ebola and one as 'suspected', the Geneva-based agency said in a statement.
(Reporting by Tom Miles; Editing by Kevin Liffey)
