Boston Doctor Develops Severe Allergic Reaction After Getting Moderna Vaccine December 31, 2020 Auto Bot allergies, Centers for Disease Control and Prevention, Coronavirus (2019-nCoV), Immune System, Moderna Inc, Pfizer Inc, Vaccination and Immunization, your-feed-healthcare 0 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.