On Thursday, an advisory CDC panel that develops vaccine guidance met for a two-day discussion on multiple childhood vaccines. Monarez worries that access to childhood vaccines is under threat—and that the public health consequences could be dire. As the current secretary of health and human services, Robert F. Kennedy Jr. oversees federal health and science agencies that include the CDC, which monitors and responds to threats to public health. Part of that role involves developing vaccine recommendations. Kennedy described her as “a public health expert with unimpeachable scientific credentials.”His opinion seems to have changed somewhat since then.