M.J.
N.,
There are several things you have to keep in mind when making this decision. First, the flu you get the shot for is not the "stomach flu" or gastroenteritis (sp?) That, unfortunately, there is no prevention for other than hand washing. The kind of flu the vaccine is for is completely different and can include dangerously high fevers, dehydration, sore throat and severely swollen lymphnodes and glands and horrible upper respiritory effects as well.
The second thing you have to consider, are you or your children around anyone that is at high risk. Such as grandparents with COPD, emphysema, pulmonary hypertension, heart conditions etc. This vaccine can stop the spread of these strains of flu to those affected individuals.
It seems ove the past several years when the flu outbreaks have been so publicized there have been very few side effect from the flu shot. (mind you not saying there have been none. There is always going to be a percentage of the population that has some reaction.) The general opinion is that it is worth it, if not to keep you or your children from getting it, then to stop the spread to the populace.
My personal opinion, we get our flu shots becuase we do have friends who are affected with some of the afore mentioned ailments and we would not be able to be around them were we not to get the shot. I think it slows and decreases the spread of some of these horribly virulent strains.