Never have never will.
We should know by now flu shots are for the flu from the previous year, they cannot make it for the strain that's coming...total bullshit I say.
I tend to use Echinacea by Vogel before I catch anything,for me that is the best brand sold at the Health food stores. I would not take the stuff in drug stores, that is the crap they test and not receive good results. I first used this for psoriasis which knocked it out of my system, I took it internally and externally. I was once told by a doctor (whom I introduced it to) she went to a function at Sunny brook hospital and found some doctors do use it but cannot inform their patients about it and NO I get nothing for this info from Vogel. Just go into a health store and ask for the best brand see what they give ya.