Centers for Disease Control and Prevention

When infectious pathogens have threatened the United States, the Centers for Disease Control and Prevention has been front and center. During the H1N1 flu of 2009, the Ebola crisis in 2014 and the mosquito-borne outbreak of Zika in 2015, the CDC has led the federal response.

At a time when the nation is desperate for authoritative information about the coronavirus pandemic, the country's foremost agency for fighting infectious disease outbreaks has gone conspicuously silent.

"I want to assure Americans that we have a team of public health experts," President Trump said at Tuesday evening's coronavirus task force briefing — a bit of reassurance that probably would not have been necessary if that briefing had included anyone from the Centers for Disease Control and Prevention.

Updated at 1:55 a.m. ET Monday

In an effort to slow the spread of the coronavirus pandemic, the Centers for Disease Control and Prevention is now advising against gatherings of 50 people or more for the next eight weeks.

Updated at 7 p.m. ET

President Trump on Friday stopped in at the Atlanta headquarters of the Centers for Disease Control and Prevention, the agency marshaling the response to coronavirus — a major political test for his administration.

The trip itself was almost derailed by coronavirus fears, and mixed signals about what was happening created an on-again, off-again drama that played out in front of television cameras. The chaotic impression clashed with the White House quest to show that the public health crisis is under control.

The city of San Antonio says more than 120 people repatriated from the Diamond Princess cruise ship will be released from quarantine at Lackland Air Force Base on Tuesday, one day after the mayor declared a public health emergency to block the evacuees from leaving the base.

Updated at 11:50 a.m. ET

Federal health officials say they have resolved a problem that has hindered wide testing for the new coronavirus in the United States, a crucial practice for fighting the spread of the dangerous new infection.

A problem with one ingredient in test kits that the federal Centers for Disease Control and Prevention distributed to labs around the country had created a frustrating bottleneck in testing, requiring most testing to occur at the CDC in Atlanta.

President Trump will hold a news conference Wednesday afternoon about the rapidly spreading coronavirus, as fears have sent the stock market into a spiral and Republican and Democratic leaders have questioned the administration's response.

Trump announced the event in a tweet and said it was a retort to media outlets such as CNN and MSNBC trying to "make the Caronavirus look as bad as possible."

On Capitol Hill, lawmakers have voiced dissatisfaction with the administration's response.

Updated at 2:10 p.m. ET

The first human-to-human transmission of the deadly Wuhan coronavirus has occurred in the U.S., the Centers for Disease Control and Prevention announced Thursday.

The respiratory virus was spread from a woman who had recently traveled in China to her husband when she returned to Chicago, CDC Director Dr. Robert Redfield said at a press briefing.

It's the sixth confirmed case of the new coronavirus, or 2019-nCoV, in the U.S.

A fifth U.S. case of coronavirus has been confirmed, this one in Arizona's Maricopa County. A statement released on Sunday from the Arizona Department of Health Services described the patient as "a member of the Arizona State University community who does not live in university housing."

Jackie Fortier / StateImpact Oklahoma

Some 10.8 million Americans had started vaping as of last year, according to a government study. The surge has been driven to a great degree by the immense success of Juul, by far the most popular vaping product.

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