Democratic Republic of Congo has confirmed a case of Ebola in the western province of Equateur, over 1,000 km away from the ongoing outbreak in the country’s east, Health Minister Eteni Longondo told journalists on June 1.

The diagnosis presents a serious challenge to health authorities. In April, Congo was days from declaring the end of the second-largest Ebola epidemic on record when a new series of contaminations was confirmed in the east.