RFK simply made up this factoid. He simply made it up. It is make believe.
(What Jamelle Bouie said also was stupid. To quote it added nothing to the article, either.)
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RFK Jr. Trashed for Latest Response to Child That Dies of Measles | The New Republic https://newrepublic.com/post/192611/robert-f-kennedy-jr-latest-response-measles-death