Many people, including some researchers, think that some or all of the symptoms of autism are caused by toxins and gut bacteria. “More than 90 per cent of children with autism spectrum disorders suffer from chronic, severe gastrointestinal symptoms. Of those, about 75 per cent suffer from diarrhea, according to current literature.”
Researchers at a Canadian university developed a vaccine to protect against a specific type of gut bacteria, Clostridium bolteae, which is found more frequenly in people with autism. This bacteria is associated with gastrointestinal problems. This vaccine is designed to protect against constipation and diarrhea and may have an effect on other symptoms.
Although this is progress, it may take 10 or more years before the vaccine is available to the public. The study is published in the journal Vaccine.