Vaccine stocks have struggled since RFK Jr.'s appointment to health secretary, with Moderna and Pfizer seeing the deepest losses.

President-elect Donald Trump said he’s tapping Robert F. Kennedy Jr. to run the Department of Health and Human Services, a move that would elevate a prominent vaccine skeptic and pharmaceutical industry critic to a top role on federal health policy.

Public health officials are decrying President-elect Donald Trump for selecting Robert F. Kennedy Jr. to head the Department of Health and Human Services. If confirmed, Kennedy would head a sprawling agency that oversees drug,