A report published earlier this month in Vaccine, utilising 5 cohort and 5 control studies, found no link between vaccination and autism. The study, lead by Guy Eslick of the University of Sydney, looked at 1,256,407 children from across the US, UK, Japan and Denmark. As well as analysing the impact of the hotly debated MMR vaccine, the study also looked at the impact of vaccines for diphtheria, tetanus, and whooping cough.
The research drew on data gathered by 12 review papers, 11 of which agreed with the conclusion drawn by this study. The paper that did not draw the same conclusion, Theoretical Aspects of of autism: cases – a review, concluded that a vaccine-autism link could not be entirely ruled out as autism results from a wide variety of environmental toxins.