Among the eight people Robert F. Kennedy Jr. announced would make up his new group of outside vaccine advisers to the US Centers for Disease Control and Prevention are an emergency physician who posted Islamophobic commentary on social media and two doctors who were paid to provide expert testimony in trials against a vaccine maker.

Multiple new members have voiced anti-vaccine views that are not based in scientific evidence. Their actions could shape the way insurers, doctors and the public make decisions about immunizations.