As a father of a child with autism, I'm glad to see this issue getting attention. The Autism Science Foundation's
position is that studies have effectively ruled out vaccines as a trigger for autism. Other bodies have taken the same position, based on currently available data.
I think its important to understand that while recent studies have not found a link, the research on this topic is not complete. Some of the studies that didn't find a link clearly stated that more research was necessary, and the that results of the study could not prove or disprove a link between vaccination and the onset of autism. There are on-going studies attempting to determine the cause / trigger for autism. It is still not known what causes / triggers autism.
Among those studies is the
CHARGE study at UC Davis. The study is continuing to enroll families who have a child or children with autism. This study is looking at the interplay between genetic and a wide range of environmental factors in autism. Vaccines are one of the many environmental factors being analyzed. The CDC and NIH are still conducting research as well.
Do I think there's a link between vaccinations and autism? I certainly hope not and current evidence doesn't support it. But some of these studies were based on statistical analysis of available data rather than direct examination. The CHARGE study is an example of pursuing an angle that is unique. Also interesting is that the methods used to diagnose autism have changed, leading to more frequent reports of autism cases. This suggests, but doesn't prove, that the link between increased vaccination rates and the rise in autism cases isn't causal.
Then there's
this:
Interestingly, the city of Yokohama, Japan has not administered the MMR vaccine to any children born since 1993. Yet, autism rates have increased even among these unvaccinated children [27]. Thus, even as scientists continue to untangle the exact causes of autism, one thing remains unchanged: no one has yet found a scientifically sound and robust link between vaccines and autism.
Interestingly, Japan still bans the MMR vaccine for reasons unrelated to autism.
Finally, there are folks in medicine who respectfully disagree with the research that has been done so far, questioning both methodology and the interpretation of the data. Some of these folks are crusaders against current vaccination practices, and believe there's an unholy alliance between the government and vaccine manufacturers: similar to the "military industrial complex", this would be the "big pharma government research complex".
Until the trigger is found, keeping an open mind and not discounting any possibility is the right thing to do. Calling people stupid because they question available evidence is hardly productive or useful.