Although nasal congestion, rhinorrhea and cough are the most common reported side effects in patients receiving this vaccine, if an allergic reaction occurs, it could manifest as more important nasal symptoms (congestion, rhinorrhea, pruritis, sneezing, edema), as well as oral symptoms or systemic symptoms, accompanied by pruritis, urticaria, wheezy breathing or, in severe cases, hypotension, throat swelling or tightness and/or difficulty breathing. An allergic reaction can also present as nausea, abdominal pain and/or sudden vomiting. Patients will be monitored closely during the whole procedure, as well as in the hour following it for the onset of these symptoms. If need be, they will be seen by the study doctor who will evaluate the need for antihistamines, epinephrine, corticosteroids or who will institute specialized techniques to maintain vital functions. The risk of a severe reaction is probably very low considering the low egg content in the vaccine.