Anything that is classed as MANDANTORY will in effect create a negative reaction.
It is a fact that Autism has been revealed before a child has had vaccines.
In reality, there is a considerable amount of evidence that genetic factors may play a part, since ASDs often seem to run in families.
Other factors that have been blamed include:
Viral infections in the womb
Drugs used in pregnancy and/or childbirth
Measles (either the virus or the vaccination against it) food intolerances or allergies
Chronic yeast infections
Infections like meningitis
It is likely that some children may be affected by some of these factors, or combinations of factors, but as yet, researchers have been unable to pinpoint a single cause, or group of causes that would explain all or most ASDs. However, there are some researchers who are very evangelical about their particular theories. Time will tell if they are on the right track.
Cause of Autism is still not known and the introduction of vaccine has not made any difference in the rise of Autism.
So until we find out, one has to make their own decision whether to immunise their children against killer diseases that are with us today.