CDC staffers are bracing for cuts that could affect up to a third of its workforce. Credit: Tami Chappell / Reuters via CNN Newsource

(CNN) โ€” Five key division leaders at the US Centers for Disease Control and Prevention are leaving the public health agency as it braces for cuts that could affect as much as a third of its workforce.

The departures, announced internally Tuesday, comprise the directors of the Public Health Infrastructure Center, the National Center on Birth Defects and Developmental Disabilities, the Office of Science, the Office of Policy Performance and Evaluation and the Office of Health Equity, according to a person familiar with the situation, who declined to be named because the announcement wasnโ€™t made publicly.

The Associated Press firstย reportedย the plans, which it said were described as retirements and announced at a meeting of senior agency leaders.

The departures come as CDC staffers anticipate Reduction in Force notifications in the coming days that could cut staff and budget by as much as 30%, according to another CDC source who saw a draft of the plans and wasnโ€™t authorized to discuss them publicly.

One staffer, who requested anonymity for fear of retribution, said CDC employees worried that the division leadersโ€™ departures suggested that those centers and offices could be hit hard by cuts.

The director of the CDCโ€™s Office of Communications, Kevin Griffis, also left the agency last week, and on Tuesday, he published anย opinion essayย in the Washington Post skewering Health and Human Services Secretary Robert F. Kennedy Jr.โ€™s leadership of government health agencies.

โ€œPublic health communications have slowed to a trickle,โ€ Griffis wrote. โ€œThe CDC hasnโ€™t held a public briefing, despite multiple disease outbreaks, since President Donald Trumpโ€™s inauguration.

โ€œInstead of seeking guidance about how to combat the measles outbreak in Texas and New Mexico from the world-leading epidemiologists and virologists he oversees, Kennedy is listening to fringe voices who reinforce his personal beliefs,โ€ Griffis continued, noting that he โ€œwatched as career infectious-disease experts were tasked with spending precious hours searching medical literature in vain for data to support Kennedyโ€™s preferred treatments.โ€

โ€œPublic health communications should be about empowering people with reliable, science-based information, so they can make their own health decisions,โ€ Griffis wrote. โ€œUnfortunately, we canโ€™t count on Kennedyโ€™s HHS for that anymore.โ€

On Monday, Trump said he planned to nominate the agencyโ€™s current acting director, Dr. Susan Monarez, as CDC director. Although some in the public health research community cheered the news, citing her long career of health work in the federal government, some agency staffers worried that she wouldnโ€™t sufficiently defend the agency against coming cuts.