Ebola has erupted again in the Democratic Republic of Congo, the country’s ninth outbreak since the virus was discovered there in 1976, and world health officials are moving unusually swiftly to contain the outbreak.

Two days after a laboratory confirmed that the virus had killed two people in the remote Equateur Province, teams from the country’s health department, along with doctors from the World Health Organization and Doctors Without Borders, had reached Bikoro, a market town about 20 miles from Ikoko Ipenge, the village at the outbreak’s epicenter.

The teams are expected to have a 15-bed treatment center and a mobile laboratory in place by this weekend, said Dr. Peter Salama, the W.H.O.’s deputy director general for emergency response.

“It’s going to be tough, and it’s going to be costly to stamp this out,” Dr. Salama said at a news conference in Geneva.