CODE OF VIRGINIA DEFINITIONS (ยง 59.1-533) As used in this chapter:”Influenza vaccine” means a vaccine, intended to be administered by injection, that contains inactivated influenza viruses, that is prepared for the applicable influenza season.”Influenza vaccine shortage period” means the period of time during which a proclamation of the Governor provides that an influenza vaccine shortage exists. HISTORY: 2005, c. 861.