Secretary of Health and Human Services Robert Kennedy Jr. this week signed a recommendation to remove thimerosal, a mercury-based preservative, from flu vaccine shots, The Wall Street Journal reports.

The Centers for Disease Control and Prevention’s Advisory Committee on Immunization Practices voted last month to recommend that flu shots not contain thimerosal, which is used to prevent fungi and bacteria from growing in multi dose vaccine vials. The recommendation was the first issued by the panel after Kennedy replaced all of its previous members.

“Injecting any amount of mercury into children when safe, mercury-free alternatives exist defies common sense and public health responsibility,” Kennedy said in a statement.

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