The outbreak, which began last August, has proved difficult to bring under control because of community mistrust and violent attacks on health care workers.
WHO epidemiologist Dr. Richard Mouzoko was killed by armed men in April while working in Butembo, in North Kivu, a province grappling with a long-term conflict and dozens of armed groups.
“Dr. Mouzoko’s death moved me profoundly,” WHO Director-General Dr. Tedros Adhanom Ghebreyesus said in a statement after the attack. “I am also profoundly worried about the situation. Cases are increasing because of violent acts that set us back each time.”
The attack took place during a coordination meeting at the hospital where Mouzoko was working.
Doctors Without Borders (Medecins Sans Frontieres) staff have also been attacked, prompting the group to suspend work in some Ebola-hit areas.
The DR Congo outbreak has affected the northeastern provinces of North Kivu and neighboring Ituri. The two provinces are among the most populous in the country and border Uganda, Rwanda and South Sudan.
Unlike the 2014 outbreak in West Africa that killed more than 11,000 people, there are now vaccines and experimental treatments for Ebola. While it warned against travel to affected areas, the WHO said the outbreak did not constitute a “public health emergency of international concern.”
Dr. Joanne Liu, international president of Doctors Without Borders, said in March that the response to Ebola had to be more community-based, treating patients as humans, “not as a biothreat.”
“People prefer to stay in the community, not go to treatment centers,” she said.
Gwenola Seroux, emergency manager at Doctors Without Borders, however, warned that it was “clear that the outbreak is not under control and therefore we need a better collective effort. The virus has not spread to neighboring countries so far, but the possibility exists.”