All parents will receive an emergency phone number to contact in case of allergic reaction within the 24 hours following vaccination. This will be the contact information of the principal investigator of the project, Dr Anne Des Roches, or the allergist on call if she is absent. Moreover, the phone number will also be provided to the telephonists of Ste-Justine Hospital who can call Dr Des Roches or the allergist on call. She (or he) will evaluate the patient for a biphasic reaction or for a delayed reaction or could have the patient come to the allergy clinic or refer the patient to the emergency department according to the situation. Parents will be advised to contact emergency services first if there is a severe delayed reaction.