The first person in New York City to undergo testing for the novel coronavirus is being treated in Bellevue Hospital, the city’s health commissioner said Saturday.

The person, who is under 40, fell ill with a fever, cough and shortness of breath — telltale signs of the illness — after returning from China and went to see a doctor, Dr. Oxiris Barbot said in a statement.

Testing showed the person didn’t have the flu or a cold virus, so a test for the coronavirus was done.

The fact that the person is being tested shows the system the city put in place to handle the outbreak is working, Barbot said.

“This is exactly what we prepared for and we thank everyone for taking all the right steps,” Barbot said.

The results of the test won’t be known until at least Monday. The federal Centers for Disease Control and Prevention is handling the test. The person was not identified, and the city didn’t say where they live.

This is the 12th possible case in New York state. Eight of those tests have come back negative, and three are still pending, Gov. Andrew Cuomo’s office said Saturday.

The possible New York City case comes after the eighth U.S. case was identified in Massachusetts late Friday.