A link may exist between autism and bacteria in a child's digestive tract, a small new study suggests.
Researchers analyzed gut bacteria in faecal samples from 20 children with autism and 20 children without the disorder. The children with autism had significantly fewer types of gut bacteria, which potentially could make them more vulnerable to harmful bacteria.
The study also found that children with autism had significantly lower amounts of three types of important gut bacteria.
Autism, a neurodevelopmental disorder that can range from mild to severe, affects social and communication skills.
The new study appears July 3 in the journal PLoS One.
"One of the reasons we started addressing this topic is the fact that autistic children have a lot of [gastrointestinal] problems that can last into adulthood," study leader Rosa Krajmalnik-Brown, a researcher at Arizona State University's Biodesign Institute, said in a university news release. "Studies have shown that when we manage these problems, their behaviour improves dramatically."
New ways to treat autism
This type of research could lead to new ways to treat autism-associated gastrointestinal problems, and improve diagnosis, prevention and treatment of autism, the study authors said.
Previous research has shown that gut bacteria plays a role in a wide range of important functions, including digestion, controlling body weight, immune response regulation and the production of neurotransmitters that affect the brain and behaviour.
Although this study showed a potential link between gut bacteria and autism, it did not prove a cause-and-effect relationship.
The U.S. National Institutes of Health has more on human microbiota.