U.S. health authorities said they’ve identified a first case of coronavirus that doesn’t have ties to a known outbreak, a worrying signal that the virus is already circulating in the U.S. despite reassurances from the Trump administration that it’s been contained. The U.S. Centers for Disease Control and Prevention said the patient doesn’t appear to have traveled to China or been exposed to another known case of the coronavirus. Health authorities have been increasingly concerned about what’s known as community spread, where the virus begins circulating freely among people outside of quarantines or known contacts ... (full story)