The latest casualty in Uganda was a nine-year-old girl from the DRC, reviving fears that the virus could cross the porous borders of the central African country.
The Ebola outbreak in the Democratic Republic of Congo showed no signs of easing on Friday on the eve of the UN chief's visit to the country.
The death toll from the highly contagious virus crossed 2,000, with a new fatality in neighbouring Uganda.
The latest casualty in Uganda was a nine-year-old girl from the DRC, reviving fears that the virus could cross the porous borders of the central African country, where it erupted in August last year.
TRT World's Philip Owira explains
DRC health officials said late Thursday that there have been "2,006 deaths (1,901 confirmed and 105 probable)" since August 2018, adding that 902 people had been cured.
The toll is a setback coming a day before UN Secretary General Antonio Guterres visits for a first-hand assessment of the fightback.
Guterres wants to "express support for the teams engaged in the Ebola fightback," the UN said.
More than 200,000 people have been vaccinated during the DRC's tenth and most serious Ebola epidemic.
It is the second-worst Ebola outbreak in history after more than 11,000 people were killed in Guinea, Sierra Leone and Liberia between 2014 and 2016.
Containment efforts have been hindered by conflict in eastern DRC as well as attacks on Ebola fighters within affected communities.
"For the moment, the situation is better than the past weeks, but in certain zones, there are many cases of community resistance. These are the zones which have brought forth the most confirmed cases," Robert Bahati from Oxfam said.
"As a result, those who came in contact with confirmed cases have not been followed up," he said.
Jean-Edmond Bnanakawa Masumbuko, the mayor of Beni — a major city which Guteress is due to visit — said some people "had the tendency of viewing Ebola treatment centres as deathtraps.
"Out of the city's 14 zones, there are only four which continue to pose problems," he said.
Fourth Uganda death
The nine-year-old girl who tested positive in Uganda after travelling from the DRC died early Friday, a Ugandan health official said.
"She passed on at around 0800 (0500 GMT) this morning," said Yusuf Baseka, health director in Kasese, a district in southwestern Uganda along the border with the DRC.
The child was diagnosed after exhibiting symptoms at a border crossing in Kasese on Wednesday.
She was subsequently isolated and transferred to an Ebola treatment unit.
The girl is the fourth victim diagnosed with Ebola in Uganda, which has been on high alert since last year, to have died from the virus.
In June, three members of a single family tested positive after entering from the DRC. Two died in Uganda, while the third succumbed to the disease after returning to the DRC.
The outbreak of the haemorrhagic virus began in the North Kivu province in eastern DRC on August 1, 2018 and spread to the neighbouring Ituri province.
The pathogen causes fever, vomiting and severe diarrhoea, often followed by kidney and liver failure, and internal and external bleeding.
The disease is spread by contact with infected bodily fluids and is fought with the time-honoured but laborious techniques of tracing contacts and quarantining them.
Stepped up checks
The World Health Organization has declared the epidemic a "public health emergency of international concern."
The virus has also spread to the DRC's South Kivu province, which shares a land border with Rwanda and Burundi.
Screening is vital, but imperfect.
Ebola can take up to three weeks to incubate and cannot be spread until the infected person has symptoms, the WHO says.
But it can be difficult to clinically tell Ebola from malaria, typhoid fever or meningitis.
Uganda has stepped up checks for hundreds of schoolchildren who cross over from the DRC every day to attend school there, as jobs and educational opportunities are greater.
But it is not without inconvenience.
"Sometimes we get to school late, because we have to be in line for checking and it takes time," said Doreane Kambari, a 16-year-old attending high school in Bwera in Kasese.