The Ebola outbreak in the Democratic Republic of Congo is still a public health emergency and will be one for at least the next three months, the World Health Organization said on Friday.

At the same time, “We believe we are on what could be a bumpy road to zero” new infections, said Dr. Michael Ryan, the agency’s director of emergency response.

Confirmed new cases, which peaked in April at nearly 130 a week, have fallen to relatively low levels. There were only 15 tallied in the last week, which the W.H.O.’s most recent update called “encouraging.”

But hot spots keep springing up in Congo. Most of the 50 new cases reported from late September to mid-October were in or connected to the Biakato Mine area, where both legal and illegal mining operations take place.