In announcing new autism prevalence data from the Centers for Disease Control and Prevention, Health and Human Services Secretary Robert F. Kennedy Jr. distorted scientific research to argue that there is an “epidemic” of autism that must be due to an "environmental toxin.

Kennedy, Hotez says, made a “false statement” in claiming that the scientific community denies that there are any environmental factors at play. “I’ve said to RFK Jr. that there could be an environmental component, but not vaccines, because autism occurs in fetal brain development well before kids ever see vaccines.”

Kennedy Jr. insists an environmental toxin is responsible for increased autism prevalence in the U.S. "This is a preventable disease," he said April 16, dismissing an HHS agency report’s explanation for the increase.