|Health personnel in protective suits when checking patients|
Health Minister Oly Ilunga Kalenga confirmed a case in Mbandaka, a city of a million about 130km (80 miles) from where the first cases were confirmed.
The city is a major transportation hub with routes to the capital Kinshasa.
At least 44 people are thought to have been infected with ebola and 23 deaths are being investigated.
Ebola virus disease is a severe, often fatal illness, with a death rate of up to 90% caused by Ebola virus. People become infected with Ebola either through contact with infected animals or through contact with the bodily fluids of infected humans.