You are correct, the "flu" I got right after taking the shot could have been a coincidence. Taking a flu shot certainly might not have been the cause of my getting whatever I had - flu or otherwise. and taking a flu shot only presents a 60% better chance that you won't catch it. I could just be lucky. But I still will not take a flu shot this year. I take zinc daily for strengthening my immume system and double the dose upon any scratchy throat or other signs of possible illness, and I almost drink hand sanitizer. I make Monk's OCD look like a normal practice. It's got me through many years without getting a cold or flu or other illnesses and if I do feel like I have a cold, it only lasts a day or two.If I catch the flu this year, I will let you know. Apparently, it's nearly an epidemic. Think I'll double the zinc dose right now.