K.K.
you can read about it here...
http://www.flumist.com/
In years past, i, too, have had the flumist myself, and 2 of my kids have had it. but i was told by my dr. that you had to be 5 yrs old to have the flumist. maybe because of the live virus, or maybe because a younger child can't be counted on to inhale it properly. funny, because i requested it this year for my 2 oldest (ages 6 and 8) and was told the mist was not available...only the shot. boy oh boy, did they complain!!! they much prefer the mist over a horrible shot!!! (their words!!)
K.