Nonprofit group Oxfam worries that upcoming local elections may trigger more violence and impede response activities.
"This outbreak has gone on far too long," WHO chief says.
Cases have hit 991, and a baby recently became one of the 614 deaths.
The past 5 days have seen 44 Ebola cases, including 12 today, though officials have noted fewer cases in children.
Cases have climbed to 968, including 606 deaths, and the WHO details more violence and infected health workers.
Alongside the slew of new cases, 12 more people died from their infections, as violence continued against outbreak responders.
The outbreak has reached 936 cases and 591 deaths.
Tedros said there are signs the virus is retreating, but added that security is still the main challenge for health workers.
The DRC and Republic of Congo had seroprevalance rates of 2% to 3.5%.
Officials report 2 new cases, as well as 3 incidents of violent encounters slowing vaccination efforts in Katwa, Butembo, and Kalunguta.
