During his presidential campaign, Kennedy developed a national profile for his criticism of the Covid vaccines and childhood immunizations.

Kennedy has been nominated to lead the federal government's health agency—what does this mean for vaccine access in the U.S.?

Shares of vaccine makers fell as President-elect Donald Trump nominated Robert F. Kennedy Jr., a prominent vaccine skeptic, to lead the Department of Health and Human Services. Health policy experts have said a second Trump term could allow Kennedy to elevate anti-vaccine rhetoric.