Pfizer changed the formulation of its Covid-19 Vaccine for Children to include an ingredient that stabilises people suffering a Heart Attack

The FDA Briefing Document titled ‘EUA amendment request for Pfizer-BioNTech COVID-19 Vaccine for use in children 5 though 11 years of age‘ states the Authorization is being requested for a modified formulation of the Pfizer‑BioNTech COVID-19 Vaccine.
Each dose of this formulation contains 10 μg of a nucleoside-modified messenger RNA (mRNA) encoding the viral spike (S) glycoprotein of SARS-CoV-2 that is formulated in lipid particles. This formulation is reduced from 30 μg adult dose age. Also ingredients changed to include 
 tromethamine (Tris) buffer instead of the phosphatebuffered saline (PBS) as used in the previous formulation. https://theexpose.uk/2021/11/01/pfizer-adds-ingredient-to-vaccine-for-kids-that-treats-heart-attacks/

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