The patient in Washington, a man in his 30s, has been released from the hospital and remains in isolation at home. The two Chicago patients have also been released from the hospital.
Thousands of cases have been confirmed in China and more than 1,000 people have died since the start of the year, Chinese officials said. There are dozens of confirmed cases in a handful of other countries as well. The first death outside of China was reported in the Philippines on Feb. 1.
Coronavirus cases in the U.S. are confirmed by the Centers for Disease Control and Prevention, based in Atlanta.
As of Feb. 10, 37 states were testing nearly 400 samples. Thirteen have come back positive.