"The outbreak remains serious" and is "evolving so fast", said Marie-Roseline Belizaire, the WHO Africa emergencies chief.

Since the outbreak was declared in the DRC on May 15, 808 cases have been confirmed in the country, including 192 deaths, according to the World Health Organization.

The fatal Ebola outbreak in the Democratic Republic of Congo is spreading rapidly, the World Health Organization warned Friday, despite accelerating efforts to tackle the virus.

"The outbreak remains serious" and is "evolving so fast", said Marie-Roseline Belizaire, the WHO Africa emergencies chief.