Inclusion Criteria:  Age ≥ 18 years Anaphylactic reaction at least 3 weeks old prior to allergology consultation, when administered a COVID-19 vaccine.  Anaphylactic reaction is defined as the occurrence within hours of administration of a COVID-19 vaccine of any of the following systemic manifestations; skin rash such as urticaria and/or angiodema, associated with respiratory signs (dyspnea, bronchospasm, desaturation), and/or digestive disorders (severe abdominal pain, diarrhea, vomiting, nausea), and/or neurological disorders (loss of consciousness, feeling of faintness), and/or hypotension, tachycardia.  Affiliation to a Social Security system Signature of the informed consent Stop taking antihistamines at least 3 days before skin allergy tests are performed  Exclusion Criteria:  Other non-anaphylactic systemic reactions after administration of COVID-19 mRNA vaccine (serum sickness, vasculitis, Guillain-Barré syndrome) Pregnancy and lactation Disorders of hemostasis or severe bleeding considered a contraindication to intramuscular injection