Health experts credit an awareness of the disease among the population and local medical staff's experience treating for past successes containing its spread.
There have been two confirmed cases of the virus and 17 deaths, the health ministry said on Tuesday.
Tourism Cabinet Secretary Najib Balala said the country has stepped up surveillance efforts, saying it is ready to screen all entry points.
An Ebola outbreak has been declared in the north-west of the Democratic Republic Congo.
There was another Ebola outbreak in the D.R.C. last year, also in a remote area, the province of Bas-Uélé.
Three health care professionals are among the confirmed cases, Ilunga said: "As health professionals are the first actors in the government's response to Ebola, this situation is of concern to us and requires a response that is all the more immediate and energetic". Without preventive measures, the virus can spread quickly between people through blood, other bodily fluids, and surfaces that have been infected.
"According to our early information, the cases have been reported since December and the first deaths were reported in January, but the link between the deaths and the epidemic has not yet been established", WHO Congo spokesperson Eugene Kabambi told Reuters.
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17 people are reported to have died from the latest outbreak in the town since December a year ago, according to the country's health ministry. The virus has a 50 percent survival rate.
The extent to which individual countries can detect, confirm and report the disease may also affect scientists' understanding of why it occurs where it does.
Whether experts will be able to find infected bats during the latest DRC outbreak remains unknown, partly because there may have been undetected cases of the disease dating back months; any culprit bat colony may have moved on by now.
Health workers who facilitate Ebola vaccinations.
High fever, weakness, intense muscle and joint pain, headaches and a sore throat are often followed by vomiting and diarrhoea, skin eruptions, kidney and liver failure, and internal and external bleeding.
Two of those samples tested positive for the Zaire strain of the Ebola virus, the ministry said. The city is home to one million residents and only a few hours away from Bikoro, the area where the majority of cases have been reported.
An outbreak of Ebola, a deadly form of viral hemorrhagic fever, has stricken Congo for the ninth time since the disease was discovered in the 1970s.