The latest figures released by the health ministry on Thursday show that 4018 people have died, making up nearly half of the 8300 confirmed cases, in what has become the fastest-growing Ebola outbreak in history.
The Democratic Republic of the Congo announced an outbreak on May 15, caused by the rare Bundibugyo virus, which has no known treatment or vaccine.
Some health workers gathered in Bunia, the capital of northeastern Ituri province, the heart of the outbreak, to demand payment for owed wages.
They were quickly dispersed by officials.
Frontline workers have gone on several strikes since the start of the outbreak to demand payment, further hampering efforts to contain the disease.
An aid worker with Medecins Sans Frontieres, known in English as Doctors Without Borders, was infected with Ebola while working in Congo, the group said in a statement.
The worker arrived late on Thursday night after being flown to the Netherlands on a special medical flight and was transferred to a high-level isolation unit, the Leiden University Medical Centre said.
"The human cost of this crisis is unprecedented in the DRC, with communities facing the largest Ebola disease outbreak ever recorded in the country," MSF said.
More than 50 health workers have died after contracting the virus.
The World Health Organisation has recently raised the alarm about the virus' rapid spread into new health zones, stretching limited resources.
Africa CDC said in its latest news conference that the number of newly confirmed cases was falling, but that could be attributed to insecurity and challenges in getting communities to co-operate in some of the hotspots.
A Congolese politician was attacked and beaten to death this week for defending government measures in dealing with the outbreak, highlighting tensions that have stretched both the health community and local resources.
The attack on Marie-Celestin Karondwa, a local official with Congo's ruling Union for Democracy and Social Progress party, took place on Sunday at his home in Butembo, an Ebola hotspot in eastern North Kivu province.
His house was set on fire afterward, and he died at a hospital from his injuries.
Widespread mistrust of health workers and the authorities has hampered efforts to slow the Central African nation's 17th Ebola outbreak.
Authorities in September launched a village-centred approach, but those efforts face resistance from residents who dismiss Ebola as a hoax.
There is also deep distrust in the country's government for reasons ranging from how it has managed past Ebola outbreaks to chronic corruption.
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