Updated

Scrutiny of federal vaccine policy intensified as it emerged that the CDC allocated $1.6 million to fund a study examining alleged harms of the hepatitis B vaccine, a trial critics are calling unethical. Separately, Health Secretary Robert F. Kennedy Jr. announced new steps aimed at identifying and treating complications from vaccines, a move that is worrying many public health experts. Both developments reflect growing tension between HHS leadership under Kennedy and mainstream scientific and medical communities over vaccine safety messaging and research priorities.