Autism spectrum disorder (ASD) is a common neuro-developmental condition affecting one in 68 people in the United States. It’s generally understood that there is a genetic aspect to ASD (it often runs in families), though environmental triggers may also play a role.

Recent studies by scientists in the Department of Neurosciences at Washington University School of Medicine in St Louis have given cause for them to think they’ve found out what could be at the root of autism and, no, it’s not vaccines. According to a new study, it could be caused by having too many brain connections called synapses.

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