New cases of the novel coronavirus in Washington, California and Rhode Island on Sunday raised fears of a wider spread of the disease in U.S. communities, prompting federal officials to ramp up efforts to test for and fight the widening outbreak.
Health officials are focused on a cluster of confirmed cases in Washington state where some patients had no clear path to exposure, including the first death from the virus in the U.S. Those cases, and several others in Oregon and California signal that there might be wider spread of the virus in some American communities with many cases still undiagnosed.