New U.S. coronavirus case may be 1st from unknown origin

Sacramento, Calif. • California and federal officials were in the midst of an intense effort Thursday to retrace the movements of a Northern California woman believed to be the first person in the U.S. to contract the highly contagious coronavirus with no known connection to travel abroad or other known causes.The woman lives in Solano County, home to Travis Air Force Base, where dozens of people infected in China or on cruise ships have been treated. But Sonia Angell, director of the Calif