China is no longer the “greatest concern” in the rapidly spreading coronavirus outbreak — as the focus shifts to the “rest of the world,” the World Health Organization said Thursday.

WHO Director-General Tedros Adhanom Ghebreyesus said there were more new cases reported outside China than inside the country for the second day in a row — as seven more nations confirmed their first cases.

China reported 440 new cases Thursday while there were 684 confirmed diagnoses in 44 other countries, he said.

“As you know, it’s what is happening in the rest of the world that is now our greatest concern,” Tedros told reporters in Geneva.

The new countries hit since Wednesday with the virus include Brazil, Georgia, Greece, North Macedonia, Norway, Pakistan and Romania.

“My message to each of these countries is: This is your window of opportunity,” Tedros said. “If you act aggressively now, you can contain this virus. You can prevent people getting sick. You can save lives. So my advice to these countries is to move swiftly.”

He said regions impacted by the deadly bug should take cues from China when it comes to containment measures.

“Every country needs to be ready to detect cases early, to isolate patients, trace contacts, provide quality clinical care, prevent hospital outbreaks, and prevent community transmission,” Tedros said.

The countries that have been spared so far from the virus should operate under the expectation that it will spread to them, he said.

“No country should assume it won’t get cases,” he said. “That could be a fatal mistake, quite literally.”

The virus, which emerged in Wuhan, China, has spread since December to more than 82,000 people across the world.