S.,
This is a subject very dear to my heart as my middle son, age 8 has aspergers ( a form of autism? depending upon what you read). There has been recent information coming from India stating that they do feel it is genetic (no kidding!) and other information. I can tell you California has changed their immunization and from what I understand they are not mandatory. I can also tell you there are some really great books out about immunizing children. Their are pediatritians who have dropped my because I was not willing to immunize my 3rd child. A really great book I had read by a Dr. suggested not giving all the immunizations at once (as they tend to do) and to boost your child's immune system before you go with vitamins and certainly do not give you child immunizations when they are ill. The peds usually will only avoid if they have a fever. The MMR is really the one with the issues related to autism, however, some flu shots still had mercury, so make sure you ask before you get one if you feel you should. I personally have not been giving my children flu shots and I have not had them over the last 3 or 4 years. I believe I had the flu the 1st year I did not get the shot, and my children have had flu free seasons as well. There is a lot of information out there and usually the Drs tell you to go to the CDC website, but their whole job is to convince you to get shots, so I feel they are a bit biased. A website I really like is natural news (WWW.naturalnews.com). Good Luck!