Cases of severe allergy have been reported in people who received the vaccine, those attributed to the presence of polyethylene glycol (PEG). Immunologists believe that pre-EXPOSURE to PEG generates antibodies that make them susceptible to anaphylactic reactions.
Más información en:
De Vries, J. Suspicions grow that nanoparticles in Pfizer's COVID-19 vaccine trigger rare allergic reactions. Sciencemag.org 21 December 2020