I have a healthy dose of suspicion about any drugs and medications foisted upon us public. I used to get flu shots and never noticed any difference in the amount of flus I got or didn't get. Haven't had them for several years in a row and still no noticeable difference in the illnesses I do or don't get. Flu shots only protect from the strains of current flus they are formulated for each year- they offer no protection from the majority of flus going around at any given time, and certainly don't protect from colds at all.
The heck with them- flu shots carry their own set of risks, and I'll just say no.