The world’s second largest Ebola virus outbreak in the Democratic Republic of the Congo (DRC) may continue killing for another six months. The forecast was made by the World Health Organization’s (WHO) deputy director-general for emergency preparedness and response, Dr. Peter Salama, during a recent interview with the University of Minnesota’s Center for Infectious Disease Research and Policy (CIDRAP) late last week. Dr. Salama cited the “complicated setting” of the DRC as one of the main reasons the outbreak has been worsening.

“This is the most complicated setting we’ve ever experienced in order to stop an Ebola outbreak,” Salama said while speaking to CIDRAP. “At a minimum, it will take six further months to stop.”

Although the initial epicenter of the outbreak—the city of Beni in North Kivu province—hasn’t seen a new Ebola case in about two weeks, the virus is still dangerously active in other areas of the country. Salama says current WHO operations are focused on Butembo and Katwa, as well as Komanda and Oicha. According to the WHO, as of January 16, 2019, there have been 668 cases of the hemorrhagic virus and 410 deaths.

“I feel we will be able to get on top of those with access, which will leave Butembo and Katwa as the main priority,” said Dr. Salama.