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As the coronavirus outbreak rages on in China, at least 110 people in the United States are undergoing testing for the new respiratory illness, the Centers for Disease Control and Prevention reported Monday.

Five people in the U.S. have been hospitalized with confirmed cases of the coronavirus: one in Washington, one in Illinois, one in Arizona and two in California.

All of those patients had traveled to Wuhan, China, the epicenter of the outbreak. Cases in China have now surpassed 2,700, and at least 80 deaths have been reported. People most severely affected have generally been older adults with underlying health conditions.

"Our thoughts are with the people on the front lines of this emerging public health threat in China," Dr. Nancy Messonnier, director of the CDC's National Center for Immunization and Respiratory Diseases, said during a call with journalists.

"This is a rapidly changing situation, both here and abroad," she added.

A handful of cases have been reported in other countries as well, including Australia, Japan, Thailand, France, South Korea, Vietnam and Canada.