Yet another study has debunked rumours of a link between the two.
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Led by Dr Anjali Jain of Falls Church, Virginia, the study found the MMR vaccine had no association with increased autism risk in younger siblings, regardless of whether their older sibling had autism or not.
The study looked at the occurrence of autism among children with older siblings. Some of the older siblings had autism, meaning their younger siblings were at a higher risk.
However, researchers found that even for children at that higher risk, there was no link between the MMR vaccine and an increased risk of autism.