The Centers for Disease Control and Prevention announced Thursday the first person-to-person spread of a new coronavirus in the U.S., but health officials believe the general public is at low risk.

A CDC spokesperson made the announcement in a conference call with reporters, marking the latest development of a worldwide virus that has killed more than 170 people in China and infected more than 8,000 people across the globe.

“Today, in conjunction with the Illinois Department of Public Health, CDC is announcing the first instance of person-to-person spread of the new coronavirus in the United States,” CDC Director Robert Redfield said during the call. “We understand that this may be concerning, but based on what we know now, our assessment remains that the immediate risk to the American public is low.”

CDC officials did not disclose the identities of the two individuals; however, they revealed the spread came from a woman who had arrived from Wuhan, China, to Illinois. She came in close contact with her husband, who health officials said contracted the virus.

CDC confirmed the first US case of person-to-person spread of #2019nCoV in a patient who had close contact w/ a traveler previously diagnosed. While the virus is not spreading widely here, it’s likely that more US cases of #2019nCoV will be reported. https://t.co/qhticS4L77 pic.twitter.com/PLXsLfNrrE

— CDC (@CDCgov) January 30, 2020

“It is because of the diligent work by health professionals that we were able to identify the second case of new coronavirus in Illinois while also taking measures to prevent others from being exposed,” Dr. Ngozi Ezike, the director of the Illinois Department of Public Health, told reporters.

“This second person testing positive for the novel coronavirus is a Chicago resident and is the spouse of the first confirmed travel-associated case in Illinois,” she said, adding that this second person did not travel to China, which indicates it was contracted via person-to-person in the U.S.

For more on the new coronavirus from The Stream, read a letter to the global church from a pastor living in the epicenter of the outbreak, Wuhan, China: Wuhan Pastor: Pray With Us.

Officials described the wife as “doing quite well” and that the husband is “stable.” Both are under quarantine.

The CDC reported an official 21 patients are under investigation in Illinois and described it as a “rapidly evolving situation.” Nevertheless, the CDC said the risk for the general public remains low, noting that the spread of this virus took place between a husband and wife who were in very close contact.

“Patients that are having the most severe outcomes are still older adults and individuals with underlying illness, and that has been relatively consistent with the data coming out from China,” a CDC spokesperson added.

There are a total of six confirmed cases of the virus in the U.S.

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