The initiation of the Pfizer-BioNtech COVID-19 vaccine in the United Kingdom and the United States of
America resulted in anaphylactic allergic reactions in 5 vaccines. The American College of Allergy,
Asthma and Immunology (ACAAI), the Centre for Disease Control and Prevention (CDC), the UK
Medicines and Healthcare products Regulatory Agency (MHRA) in collaboration with the British Society
of Allergy and Clinical Immunology (BSACI), the Hellenic Society of Allergy and Clinical Immunology
(BSACI) and the Hellenic National Committee for Vaccination have produced guidance on the risk of
allergic reaction during vaccination.