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@CaulfieldTim @BMJPublicHealth @jonathanstea @DocMCohen @AntibioticDoc @doritmi @ImmunizedotCa @ScienceUpFirst @SabiVM @KatharineSmart @CanPaedSociety @STWorg The Pfizer-BionTech COVID-19 #vaccine contains 4-hydroxybutyl, a substance used by scientists to