I should have followed his advice
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The patient, who has a severe shellfish allergy, recovered quickly with treatment. Until now, reports of severe reactions had been linked to the Pfizer vaccine.
nytimes.com
https://www.google.com/amp/s/www.nytimes.com/2020/12/25/health/Covid-moderna-vaccine-allergies.amp.html
Life-threatening responses seen in at least eight people could be linked to polyethylene glycol, known to trigger reactions to some drugs
sciencemag.org
https://www.sciencemag.org/news/2020/12/suspicions-grow-nanoparticles-pfizer-s-covid-19-vaccine-trigger-rare-allergic-reactions