There’s great concern about the spread of the novel coronavirus in countries outside China and among people with no connection to China or Wuhan, World Health Orginization Director-General Tedros Adhanom Ghebreyesus said Friday.

There’s still a window of opportunity to contain the virus, Tedros said, “but the window of opportunity is narrowing.”

WHO is calling on countries to continue containment measures while preparing for community transmission, he said. He said China’s containment measures in Wuhan and elsewhere are “hammering” the virus and can help contain it.

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"We must not look back and regret that we failed to take advantage of the window of opportunity we have,” he said.

The outbreak can still go any direction, Tedros said, and countries need to prepare for any eventuality.

Dr. Sylvie Briand, director of the World Health Organization's Infectious Hazards Management Department, said the agency is working to prepare countries’ health care workers with training and making sure they know how to protect themselves, and to make sure countries have enough workers to handle a number of cases.