New cases in three U.S. states raise prospect of local, person-to-person spread. Troubling new signs of how the coronavirus is spreading in the United States emerged on Friday, as cases not explained by overseas travel or contact with a person known to be infected were reported in California, Oregon and Washington State. Officials from the three states announced that their testing had found new cases: a high school student from Washington State; an employee of a school in Oregon, near Portland; and a woman in Santa Clara County, Calif., in the heart of Silicon Valley. Sixty-five cases of the virus have been reported in the United States, but until this week, all of them could be explained by overseas travel or contact with someone who had been ill. The three new cases on Friday, and a case earlier in the week, in California, were the first in the United […]