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.

In a move guaranteed to alarm many, President-elect Donald Trump has chosen Robert F. Kennedy Jr., a vocal opponent of vaccines and other tenets of mainstream health care, to head the massive U.S. Department of Health and Human Services (HHS).

The nearly $2 trillion agency administers health-insurance programs for millions of Americans, approves medications and oversees vaccine safety.

Shares in European vaccine-makers fell in early trade on Friday after U.S. President-elect Donald Trump said he had selected Robert F. Kennedy Jr., who has previously spread misinformation on vaccines,

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President-elect Donald Trump praised Robert F. Kennedy Jr. while speaking at Mar-a-Lago on Thursday night, saying that "nobody's going to be able to do it like you." Trump nominated Kennedy for Secretary of Health and Human Services earlier in the day,