A team of 12 experts from Congo's health ministry will arrive in Beni on Thursday to set up a mobile lab, the ministry said.
This is the vast, forested central African country's 10th outbreak since 1976, when the virus was discovered near Congo's Ebola river in the north.
The World Health Organization said it had begun moving staff and supplies into the area. Another six who are still living are showing signs of fever, of which four tested positive.
The new cases are in Mangina in the eastern Mabalako health zone, about 30 kilometers (18 miles) west of Beni, a city of more than 230,000 people.
The health minister, Dr Oly Ilunga Kalenga, said there was no indication that the two outbreaks were related.
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Officials have said they now feel better prepared for Ebola outbreaks, in sharp contrast to the 2014 epidemic of the virus, which killed more than 11,000 people, mostly in Guinea, Liberia and Sierra Leone.
He says identifying the type of Ebola virus that is circulating is a priority, as that will tell scientists whether the vaccine used to help contain the outbreak in Equateur province can also be used in North Kivu.
However, the outbreak "is occurring in an environment which is very different from where we were operating in the northwest", it quoted Peter Salama, deputy director-general for emergency preparedness and response as saying. There is no evidence suggesting a link between the latest cases and an outbreak in northwestern Congo that killed 33 and was declared over last week.
There is no specific treatment for Ebola, and the virus can be fatal in up to 90 percent of cases, depending on the strain. "The major barrier will be safely accessing the affected population".
It is believed to be spread over long distances by bats and can turn up in bush meat, available at food markets throughout Congo.
Transmission among humans then typically spreads through close contact with the blood, body fluids, secretions or organs of someone who is sick with Ebola or has recently died.