The Centers for Disease Control and Prevention (CDC) has reported the first human-to-human transmission of coronavirus in the United States. 

The patient is the husband of a 61-year-old Chicago woman who contracted the virus last week after returning from Wuhan, China, the epicenter of the virus, officials said on Thursday, Jan. 30.

Officials stressed that husband, who is in his 60s and has underlying health issues, and his wife had continued close contact while she was symptomatic, exposing him to the virus. He did not travel to China and has not been to any mass gathering, officials said. He is stable and is being treated in isolation. 

It is the second case of the virus in Illinois and it is believed to be the sixth confirmed case nationwide. The other cases are in Washington, California, and Arizona.

His wife is being treated in isolation at St. Alexius Hospital in Hoffman Estates.

According to CBS Chicago, the 61-year-old traveled back from China to Chicago on Jan. 13 but wasn’t showing symptoms then until a week and a half later. She had shortness of breath and fever when she arrived at the emergency room and was quickly placed in isolation, officials said. Her condition is described as good. 

Doctors continue to monitor everyone the woman encountered since she returned from China two weeks ago.

At this time, the CDC said it does not recommend the general public wear masks, but that those who have recently traveled to China be vigilant about reporting possible symptoms.