My advice is if you want the flu get the flu shot.
Also, I have a cousin who nearly died from the flu mist nasal inhalant a few years ago. It caused ensephalitis and they were at the end of options when they were finally able to relieve enough pressure on his brain to keep his organs from shutting down while he was in a coma. Its been a long road back and he still struggles with coordination, & memory and speech issues to this day. But the good Lord said it wasn't his time!!