In Oregon, officials say that an elementary school employee was among the new, unexplained cases. Dr. Dean Sidelinger, Oregon’s state health officer, said a broader shutdown of schools was an option the state could pursue at some point.
On Friday night, health officials there announced that a teenage boy and a woman in her 50s had tested positive for coronavirus. The woman had recently spent time in South Korea. The boy, a high school student, had not traveled to any high-risk areas. The student’s high school will not reopen until Tuesday, and some peers who were in contact with him will be kept out of school for at least 14 days, officials said.
Dr. Jeff Duchin, health officer for Public Health Seattle & King County, warned that businesses should be prepared to allow employees to work from home and that people may need to consider avoiding crowds.
In Washington, D.C., Dr. Fauci, a federal health official for more than 35 years and one of the nation’s most trusted voices on epidemics, rejected reports that Trump officials had sought to prevent him from speaking on television for fear that his analysis would be too dire.
“I’m not being muzzled by this administration,” Dr. Fauci said.
The president, who, for his part, is anxious about the virus and the toll it has taken on the stock market, which he tracks closely as a measurement of his economic record, suggested that the crisis was manageable and that “the markets will all come back.”
“For a period of time, we’re going to have to do whatever is necessary — safety, health, number one — and the markets will take care of themselves,” Mr. Trump added.
Michael Crowley reported from Washington, Mike Baker from Seattle and Nicholas Bogel-Burroughs from New York. Reporting was contributed by Nicholas Fandos from Washington, Claire Cain Miller from Lake Oswego, Ore., Mitch Smith from Chicago, Choe Sang-Hun from Seoul, South Korea, Farnaz Fassihi from New York, and Norimitsu Onishi from Paris.