The experts from the U.S. Centers for Disease Control and Prevention huddled in a room with Bela Matyas, health officer of Solano County, California. They had a raft of questions about a milestone case in the spread of the coronavirus: the first U.S. victim with no known connection to travel in Asia.

¡°Did she go to the spa?¡± they wanted to know late last week. ¡°Did she go to church? Did she go to a playground?¡±

Now, the CDC is sending another team to Washington state, where the first U.S. virus death was reported Saturday after a potential outbreak at a King County health facility that cares for the elderly. The county reported a second death late Sunday, and there were at least two other confirmed cases in Washington, two in Florida, three in California and the first in New York and Rhode Island.