Biden Official Says New Study Is ‘Wake Up Call’ After Pfizer’s Efficacy Plummets to 42% as Delta Variant Takes Hold • Children's Health Defense

A new preprint study raises concerns about the effectiveness of mRNA COVID vaccines — particularly Pfizer's — against the Delta variant.

Biden Official Says New Study Is ‘Wake Up Call’ After Pfizer’s Efficacy Plummets to 42% as Delta Variant Takes Hold

A new preprint study showed mRNA vaccines’ effectiveness plummeted in July when Delta variant was dominant — with Moderna only 76% effective and Pfizer only 42% effective against infection.