Recommendations on fractional influenza vaccine dosing

"Influenza vaccination in Canada is provided annually through provincial and territorial seasonal influenza vaccine programs. Due to the rapid timelines required for vaccine production each year, any significant impact to the manufacturing process may cause delays in influenza vaccine delivery or decrease the overall number of doses produced, potentially resulting in vaccine shortages for a season. A significant and unexpected increase in demand for the influenza vaccine may also lead to insufficient supply, as the number of doses available is based on orders made primarily in the spring months. A strategy for the administration of fractional influenza vaccine doses (i.e., less than a full dose) might be considered in these situations, as the use of fractional doses would provide vaccine programs the ability to vaccinate a larger number of people with the amount of vaccine that is available." - Recommendations on fractional influenza vaccine dosing