A startling new vision of vaccination in America is becoming clearer — one likely to involve fresh scrutiny of established science and practices, and limits on vaccines that have been studied for decades.

Kennedy dropped the U.S. Centers for Disease Control and Prevention's recommendation that healthy children and pregnant women should receive COVID-19 booster shots. He

Susan Monarez declined to distance herself from the handling of the U.S. measles outbreak by HHS Secretary Robert F. Kennedy Jr.