Background There is no widely adopted severity grading system for acute allergic reactions,
including anaphylactic and nonanaphylactic reactions, thus limiting the ability to optimize
and standardize management practices and advance research. Objective The aim of this
study was to develop a severity grading system for acute allergic reactions for use in clinical
care and research. Methods From May to September 2020, we convened a 21-member
multidisciplinary panel of allergy and emergency care experts; 9 members formed a writing …