New cases are confirmed in the United States, France and Australia.

The Centers for Disease Control and Prevention announced on Friday that a second case of the coronavirus had been confirmed in the United States: a woman in her 60s in Chicago who had recently traveled to Wuhan, China, the center of the outbreak.

The other case, a man in his 30s, was in Washington State.

The unidentified woman returned to Chicago on Jan. 13, officials said. She became ill days later. As of Friday, she was still hospitalized but was doing better. Officials at a news briefing declined to name the hospital.

The C.D.C. told reporters that 63 patients in 22 states were under investigation for the coronavirus; 11 have tested negative.

France became the first country in Europe to report the infections. The Health Ministry reported three confirmed cases — two in Paris and one in Bordeaux. All three people had spent time in China.

Agnès Buzyn, the health minister, told reporters earlier Friday that France reported the first European cases “because we were very quick in establishing the test and identifying the cases.”

Australia reported its first confirmed case on Saturday: a man in his 50s visiting from China, who was being treated in a Melbourne hospital. The authorities there said he had been in Wuhan before falling ill, and that he had arrived in Melbourne on Sunday, on a flight from Guangzhou.

American officials have announced expanded screenings for the infection at major airports in the United States. In addition to New York, Los Angeles and San Francisco, airports in Atlanta and Chicago began examining passengers arriving from Wuhan for signs of illness.