America's vaccine policy has been set for decades, with patients, providers, scientists and insurers more or less in sync on the merits of immunizations.
In the last several weeks, Health Secretary Robert F. Kennedy Jr. has upended long-standing norms, introducing uncertainty into a once-reliable system.
Why it matters: Access to health care may shift in unpredictable ways. At worst, infectious diseases once thought to be eradicated could return.
