Public health officials were retracing the steps of a Northern California woman on Thursday believed to be the first person in the U.S. to contract the highly contagious coronavirus without traveling internationally or in close contact with anyone who had. The diagnosis, confirmed Wednesday, marks an escalation of the worldwide outbreak in the U.S. because it means the virus could now spread beyond the reach of quarantines and other preventative measures. Doctors at the UC Davis Medical Center said they asked the U.S. Centers for Disease Control and Prevention to test the woman for the virus after she was admitted on Feb. 19.

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