FluMist

Live attenuated influenza vaccine (LAIV) is a type of influenza vaccine in the form of a nasal spray that is recommended for the prevention of influenza.[2] In June 2016, the Centers for Disease Control and Prevention (CDC) stopped recommending the use of LAIV as its effectiveness had appeared to have decreased between 2013 and 2016,[3][4] but this recommendation was reversed in February 2018, for the 2018-2019 influenza season.[5 ... [wikipedia]