Allergy and COVID-19 Vaccines

Eligible patients will be identified via the pharmacovigilance centers and allergology hotlines set up in each center, according to the organization specific to each hospital site. .

The patient identified in this way will be contacted by the secretariat of each allergology center to schedule an allergology consultation at least 3 to 5 weeks after the reaction (the usual delay before exploring an anaphylactic reaction to avoid the risk of false negatives). Then, in the framework of a collegial meeting ,the patient's file will be reviewed in order to specify the history of the allergic disease and the modalities of subsequent COVID-19 vaccination.

A follow-up telephonique call at 6months will be made systematically for patients who have continued vaccination to ensure that there are no significant adverse events related to the COVID-19 vaccine.

Inclusion criteria

• Age ≥ 18 years
• Anaphylactic reaction to a COVID-19 vaccine administered by Pfizer-BioNtech or Janssen or Vaxzevria or Moderna, at least 3 weeks old at the time of the allergology consultation.

An anaphylactic reaction is defined as the occurrence of any of the following systemic manifestations within a few hours of administration of a COVID-19 vaccine:

• skin rash with urticaria and/or angiodema,
• and/or associated with respiratory signs (dyspnea, bronchospasm, desaturation), and/or digestive disorders (intense abdominal pain, diarrhea, vomiting, nausea), and/or neurological disorders (loss of consciousness, feeling of malaise), 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