I have flu yet again. I had a flu jab back in October, now beginning to think it was a dud. I have had them for many years as I was a carer for the elderly. I retired three years ago and thought I would continue to have it even though I now have to pay. Speaking to a couple of friends, they also said they had been ill, despite the jab. I was wondering if they has some left from last year and used them lol. This is the third time since October. It's not a cold as I have had temperature of 103 and ached all over. Has anyone else found they have suffered something similar. What is a good thing to take to boost my immune system.