A number of other health agencies are also operating without acting heads, including the FDA and the National Institutes of Health.

An email obtained by NPR says NIH employees are subject to a travel freeze and offers of employment are being rescinded. Scientists worry about disruptions to critical research.

Federal health officials have been instructed to temporarily stop any “external communications” to the public, according to two officials with knowledge of the situation.

The Trump Administration has frozen many federal health agencies’ communications with the public until at least the end of the month.

One of the CDC's weekly health publications was not published on its regular schedule, and some data about flu and vaccinations wasn't updated.

Louisiana Gov. Jeff Landry has urged the U.S. Senate — including specifically Sen. Bill Cassidy, a fellow Republican from Louisiana — to support Robert F. Kennedy Jr., President Donald Trump's nominee to lead the U.S. Department of Health and Human Services.

The Trump administration told federal public health agencies like the CDC that they are not to communicate health messages for now. The hold includes memos, reports, online posts, website updates and other forms of communication. Scientific meetings were also canceled for the time being, including of advisory panels.

According to agency officials and knowledgeable people, the Trump administration has directed federal health agencies to freeze external communications, including weekly scientific reports, health advisories and website updates.

The U.S. Department of Health and Human Services has paused public communications until Feb. 1 as Trump appointees take control of health agencies.

The Trump administration’s freeze on communications from U.S. health agencies is leading to another disruption: the abrupt cancellation of scientific meetings. The move covers a swath of health conditions,

HHS and its agencies "help health care providers and the public learn about and respond to public health incidents and threats, including outbreaks of infectious diseases," including bird flu, dengue, measles and other diseases, according to the resolution text.

Dr. Dorothy Fink, the acting secretary for the Department of Health and Human Services under President Donald Trump, has instructed the heads of every federal health agency to stop public communication.