The Centers for Disease Control and Prevention is stopping a successful flu vaccination campaign that juxtaposed images of wild animals, such as a lion, with cute counterparts, like a kitten, as an analogy for how immunization can help tame the flu.

The news was shared with staff during a meeting on Wednesday, according to two CDC staffers who spoke with NPR on the condition of anonymity because they were not authorized to speak publicly, and a recording reviewed by NPR.

During the meeting, leadership at the National Center for Immunization and Respiratory Diseases told CDC staff that the Department of Health and Human Services had reviewed the campaign and advised that it would not continue.

The move comes during Robert F. Kennedy Jr.’s first full week on the job as head of HHS.