As H5N1 spills into more people and animals, scientists warn it could evolve to better infect humans and become more dangerous.
Trump's choice to lead the Department of Health and Human Services, Robert F Kennedy Jr., has an extensive history of making inaccurate and misleading statements on vaccines and infectious diseases.
Scientists who study the vaccines are deeply troubled by Kennedy's statements. "They are false, baseless and inaccurate," says Dr. Paul Offit.
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