Eleven people have died in an outbreak of the Ebola virus in north-western Congo, the health minister has said.
There is no cure for Ebola
Alain Moka said there was an epidemic of the virus in the Mbomo district.
Authorities said 13 cases of the highly contagious disease had been identified and movement throughout the area was being closely monitored.
The same region was quarantined in 2002, when an outbreak of Ebola - for which there is no cure - killed more than 100 people.
"Samples taken from the victims and analysed in a specialised centre... proved positive," Mr Moka said.
Ebola passes quickly from person to person, through bodily fluids such as mucus, saliva and blood.
It causes massive internal haemorrhaging and leads to death in as many as 90% of those who become infected.