This is a very interesting topic.
Immune system and autism:
https://autism.org/immune-system-function-autism/
https://neurolaunch.com/autism-and-autoimmune-disease/
Dysbiosis and autism:
https://gutpathogens.biomedcentral.com/articles/10.1186/s13099-020-0346-1
Dysbiosis and glyphosate:
https://repository.arizona.edu/handle/10150/628080
I think there is a ton of research that can be done on this topic.
Furthermore, let us not forget that during COVID stimulant medication became unobtainable after a flood of people were needing the medication due to new ADHD diagnoses. To add to that, often people with ADHD or ASD find that they are diagnosed with one and may suspect they have the other or actually be diagnosed with the other. The two diagnoses share some common traits in executive disfunction.
autism.org
The Immune System & Autism - Autism Research Institute
A 2018 study at UC Davis MIND Institute found that children with autism spectrum disorder (ASD) have reduced immune system regulation, as well as shifts in their gut microbiota. Biomarkers & ASD A half-day symposium providing insight into research