A second Ebola patient has died in the Democratic Republic of Congo days after a fresh outbreak emerged in the city of Mbandaka, in Equateur province.
The World Health Organization (WHO) said the second fatality was a female relative of the first case.
"By the time the team got to her, it was already too late. She died before receiving any treatment. Both of them were buried in line with safety guidelines," he added.
On Monday health authorities said more than 100 people had been identified as possible contacts, and a vaccine was expected to be rolled out this week.
DR Congo has seen 13 previous Ebola outbreaks, including one that ended two years ago, which causes more than 2,000 deaths.
Samples analysed at the main laboratory in Kinshasa showed that the new outbreak is not linked to previous ones.
Investigations are ongoing to determine the source of the new outbreak.