<unk>  <unk>  is a type of<unk>  vaccine in the form of a nasal spray that is recommended for the prevention of<unk> . In June 2016, the Centers for Disease Control and Prevention (CDC) stopped recommending the use of<unk>  as its effectiveness had appeared to have decreased between 2013 and 2016, but this recommendation was reversed in February 2018, for the 2018-2019<unk>  season. It is an<unk>  vaccine, unlike most<unk>  vaccines, which are inactivated vaccines.<unk>  is administered intranasally, while inactivated vaccines are administered by intramuscular injection.<unk>  is sold under the brand name FluMist Quadrivalent in the United States and the brand name Fluenz Tetra in the European Union. FluMist was first introduced in 2003 by MedImmune.
Live attenuated influenza vaccine
Adenovirus vaccine
Universal coronavirus vaccine
Hantavirus vaccine
Respiratory syncytial virus vaccine
Universal flu vaccine
Measles vaccine
Rotavirus vaccine