In Canada, the flu vaccine is indicated for all children between 6 and 23 months of age. Epidemiologic and clinical studies have demonstrated that these children have a higher risk of complication and a higher rate of hospitalisation due to influenza. Trivalent inactivated influenza vaccines (TIV), which are administered intramuscularly, have long been used for preventative vaccination in this population. FluMist® is a live attenuated influenza vaccine (LAIV) administrated intranasally, which has been approved for use in Canada since 2010[1 ]. Besides avoiding the inconvenience and the anxiety related to intramuscular vaccines, FluMist® offers a better protection against influenza than the TIV. The Canadian National Advisory Committee on Immunization (NACI) recommends the preferential use of LAIV over TIV for influenza immunization in children 24 months old and over. Furthermore, LAIV use is favoured for children with chronic disease and those suffering from non-severe asthma [ 2].