Passengers traveling to Ghuangzhou, China takes precautions by wearing masks following an outbreak of the Coronavirus in China at Addis Ababa Bole International Airport on January 31, 2020. Photo: Luke Dray / Stringer/Getty Images
A 7th coronavirus case has been confirmed by the Centers for Disease Control and Prevention where a man in the San Francisco Bay area became ill after traveling from Wuhan, China back to the U.S., the Santa Clara Health Department said Friday.
The big picture: Federal health officials expect more cases to be confirmed while the CDC continues to test cases and as state health departments remain on high alert. The U.S. on Friday declared a public health emergency and restricted travel based on the new virus's ability to spread from person-to-person.
Go deeper: Coronavirus: The latest developments