I think there's way more to it - perhaps a link between certain gene carriers and the vaccines, but across the board on the whole, I don't think it's vaccines alone that "cause" autism. About the flu vaccine - I have a friend who is a scientist at St. Jude - and they work on the flu vaccine each year. He says it is always a highly educated guess. These things can't be precise. I prefer not to get the shot - I rarely get the flu and when I do my body does a good job keeping me alive. However, my son has asthma, and when he gets sick, it's always 10 x worse than the rest of us - so I do make him get the shot.