HHS has not offered details on the timing of the placebo plan or specify the vaccines involved.
The statement said none of the childhood vaccines recommended in the US - except the Covid shot - had undergone "inert placebo" testing, meaning "we know very little about the actual risk profiles of these products".
In fact, all new immunizations already go through the trials - a type of random testing where one test group receives the immunization, and the other gets a placebo, like a saline shot.
The coronavirus shot, for example, already has gone through rigorous safety testing, said Paul Offit, director of the Vaccine Education Center at Children's Hospital of Philadelphia.
"All we're doing this year is using a different Omicron variant that we used last year and the year before that.".
An HHS spokesperson told the BBC that "significant updates to existing vaccines" may be considered "new products" requiring additional clinical evaluation.
Kennedy also promoted alternative treatments, which doctors say patients should not use without medical supervision. »
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