The Journal of the American Medical Association (21 April 2015) published online a paper by Jain & others, Autism occurrence by MMR vaccine status among US children with older siblings with and without autism.

The abstract concludes:

In this large sample of privately insured children with older siblings, receipt of the MMR vaccine was not associated with increased risk of ASD, regardless of whether older siblings had ASD. These findings indicate no harmful association between MMR vaccine receipt and ASD even among children already at higher risk for ASD.

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