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By comparison, Italy reported 49 deaths from the virus on Friday.

Outside of Wuhan, the spread has effectively stopped, according to the official figures. All but one of the 99 new cases reported on Saturday were in Wuhan or were people who had traveled to China from abroad.

The World Health Organization says China’s containment measures may have saved hundreds of thousands of people from infection. Its efforts show that uncontrolled spread of the virus “is not a one-way street,” Dr. Tedros Adhanom Ghebreyesus, the group’s director general, said on Thursday.

“This epidemic can be pushed back,” Dr. Tedros said, “but only with a collective, coordinated and comprehensive approach that engages the entire machinery of government.”

W.H.O. experts sent to China have also highlighted clinics that could diagnose hundreds of cases a day with CT scans and laboratory tests, and the mass isolation centers in stadiums in Wuhan that separated people who had mild infections from their families.

“There’s no question that China’s bold approach to the rapid spread of this new respiratory pathogen has changed the course of what was a rapidly escalating and continues to be a deadly epidemic,” Dr. Bruce Aylward, the leader of the W.H.O. team that visited China, told reporters in Beijing late last month.

The numbers suggest that aggressive quarantine measures, when fully enforced, could choke the spread of the virus, said Dr. William Schaffner, an infectious disease specialist at Vanderbilt University.

“This is the largest public health experiment in the history of humankind,” Dr. Schaffner said. “They can’t turn it off, but they did turn it down. And it did provide the rest of the world with some extra time.”