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

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