Let me list below step by step how the studies clearly show that aluminum can cause autism.
It seems quite clear from these eleven discoveries that aluminum in vaccines can trigger autism. The biological pathways and mode of operation are now firmly established by science. It is interesting to note that many parents of autistic children have reported that it was after receiving the MMR vaccine at month 13 that their child regressed into autism. There is no aluminum in the MMR vaccine. It is a live virus and thus does not require any adjuvant to stimulate the immune system. So, what is happening? Science can now provide an answer. The live virus provokes a strong immune response as it should. One of the signals the immune system triggers is the release of something scientists call macrophage transport mechanism (MCP-1). MCP-1 is produced in the brain's microglia cells. It is a signal for summoning macrophages to travel to the brain. What seems to be happening is the brain now gets a swarm of macrophages. Those macrophages are carrying nanoparticles of aluminum from previous vaccine injections. Aluminum can lay dormant for years until a sufficient amount is carried into the brain leading to an immune activation event. This certainly explains how this apparent anomaly can occur.
One other obeservation. In 1999, in response to the FDA Modernization Act, the FDA began eliminating mercury from pediatric vaccines. By 2003, most of the thimerosal (mercury) was removed. Thimerosal was used as an anti-bacterial preservative in multidose vaccine vials. It is not an adjuvant to hyperstimulate the immune system. When the switch was made to single-dose vials, the need for thimerosal disappeared. This was a good thing because even the CDC published a study showing an increase in tics related to thimerosal levels in children. But aluminum levels are extremely high and growing. This is the heavy metal that needs to be addressed immediately. For more information on vaccinations, see my book, There's An Elephant in the Room - Exposing Hidden Truths in the Science of Health.