DS2 had it at a year old, he was poorly and fevery but we kept his fluids up and he got over it with a course of tamiflu (which they reported the following week didnt work anyway! so worth the hassle of getting it into him!)
my two boys were offered the jab to which I politely declined ds2 cant have it anyway because he had the tamiflu.
Im just not concerned, I trust my instincts enough to know if my kids are that ill that they need medical attention, outside of that its just flu! IMO