If you doubt the validity of vaccines and autism then here is some info and studies for you that might help.
"Christopher Exley is one of the foremost experts on aluminum and aluminum toxicity within the human body. Listen as he explains and describes the results of his recent aluminum adjuvant related vaccine study with co-authors!!! The title of that study is: Aluminium in brain tissue in autism.
https://www.sciencedirect.com/science/article/pii/S0946672X17308763
Excerpt from study:
Autism spectrum disorder (ASD) is a group of neurodevelopmental conditions of unknown cause. It is highly likely that both genetic [1] and environmental [2] factors are associated with the onset and progress of ASD while the mechanisms underlying its aetiology are expected to be multifactorial [3], [4], [5], [6]. Human exposure to aluminium has been implicated in ASD with conclusions being equivocal [7], [8], [9], [10]. To-date the majority of studies have used hair as their indicator of human exposure to aluminium while aluminium in blood and urine have also been used to a much more limited extent. Paediatric vaccines that include an aluminium adjuvant are an indirect measure of infant exposure to aluminium and their burgeoning use has been directly correlated with increasing prevalence of ASD [11]. Animal models of ASD continue to support a connection with aluminium and to aluminium adjuvants used in human vaccinations in particular [12]. Hitherto there are no previous reports of aluminium in brain tissue from donors who died with a diagnosis of ASD. We have measured aluminium in brain tissue in autism and identified the location of aluminium in these tissues."
"157 Research Papers Supporting Vaccine/Autism Causation"
https://www.scribd.com/doc/220807175/146-Research-Papers-Supporting-the-Vaccine-Autism-Link
Relevant to the question of the importance of aluminum and vaccines.
"MERCK'S DIRTY LITTLE SECRET - BY DR. SUZANNE HUMPHRIES"
More info and resources that is relevant is found at http://www.dirtybigpharmatruth.com/high-levels-of-aluminum-found-in-autistic-childrens-brain-tissue.html