FluMist is the product name of a nasal spray influenza vaccine manufactured by MedImmune, Inc. first introduced in 2003. FDA approval letter It was the first and (as of 2007) the only live attenuated vaccine for influenza available outside of Europe, and is also called Live Attenuated Influenza Vaccine (LAIV). CDC Q&A about nasal-spray influenza vaccine FluMist does not contain thimerosal or other preservatives.