A second patient in the United States has been found to be infected with the Wuhan coronavirus, the Centers for Disease Control and Prevention announced on Friday.

The patient is a woman in her 60s who had traveled to Wuhan, China — the epicenter of the outbreak — and returned to Chicago on Jan. 13. She did not become ill until several days after arriving in Chicago, so officials do not think there is much risk to others who were on her flight home.

She did not take public transportation, attend any large gatherings or have close contact with anyone outside her home after returning, officials said. Members of her household are being monitored.

The woman was taken to a hospital, but she is doing well and is being kept there primarily to keep the infection from spreading, officials said at a news briefing. They declined to name the woman or the hospital.