Health workers at the Bunia General Hospital went on strike on Wednesday, the latest group to have walked off their job at the epicentre over payment issues.
Health professionals and other frontline workers barricaded the entrance of the hospital, lamenting they have not received compensation despite working under difficult conditions.
A total of 753 patients remain in isolation or in hospitals, while 366 have so far recovered, according to data from Congo's health ministry.
Contact tracing remains a challenge, with coverage of those exposed still at 67 per cent.
The Central African nation has been battling the Ebola outbreak caused by the rare Bundibugyo virus since May 15.
Two months since the onset, the outbreak continues to spread faster than health officials can track despite an expanding response.
At least 80 per cent of new cases are emerging from unknown chains of transmission, the World Health Organisation said on Tuesday.
A key challenge is that health authorities have yet to identify the outbreak's patient zero, while displacements from armed conflict as well as mining-related movements have made it difficult to trace thousands who have come in contact with infected individuals.
Many of the newly reported deaths are people who died in their communities without ever reaching a health facility and without receiving care, Dr Chikwe Ihekweazu, the WHO health emergencies chief, said on Tuesday after returning from Bunia in Ituri, the worst-hit province in the outbreak.
Health workers are also going on strike in different parts of Ituri.
Some have told The Associated Press they have not received any payment since they started work at the onset of the outbreak.
Response efforts have also been challenged by the lack of approved vaccines or treatments for the Bundibugyo virus, unlike the more common Zaire virus for which there is a vaccine and which was responsible for most of Congo's past 16 outbreaks of the disease.
Enrolment for a highly anticipated study of two possible Ebola treatments recently began in Ituri.
