The research team reached their conclusion after looking at every child born in Denmark to Danish-born mothers between 1999 and 2000.
"The study strongly supports that MMR vaccination does not increase the risk for autism, does not trigger autism in susceptible children, and is not associated with clustering of autism cases after vaccination", the authors from the Statens Serum Institut in Copenhagen conclude in their paper.
The findings, published in the scientific journal Annals of Internal Medicine, come at a very relevant time as the number of measles cases has tripled across Europe from 2017 to 2018, including a small outbreak in Denmark at the moment.
Examining 5,025,754 person-years of follow-up data, the researchers found 6,517 children that were diagnosed with autism.
The researchers gathered information on the children's MMR vaccination status, other childhood vaccines, autism diagnoses, sibling history of autism, and autism risk factors, and then followed the children from 1 year of age until 31 August 2013.
The virus can live for up to two hours on surfaces where an infected person coughs or sneezes. This may seem to be in malice because of the dangers of not vaccinating imposes, but this is not the case. Their study followed child births in Denmark from 1999 to December 31, 2010, and then followed up with the children from 1 year old until the study was completed in 2013.
"Anti-vaxxers" refuse to immunise children, in the (mistaken) belief that vaccines cause conditions such as autism.
The Centers for Disease Control and many others have long noted there's no proven link between vaccines and autism, and now the agency has yet another study to back those claims.
Another drawback is the potential for some kids to have undiagnosed autism before getting the MMR vaccine, which could make the MMR vaccine appear linked to autism when it really isn't connected, the study authors note.
Still, the study adds to a large body of evidence showing that vaccines don't cause autism, writes Dr. Saad Omer of Emory University in Atlanta, co-author of an accompanying editorial. "Even in the face of substantial and increasing evidence against an MMR-autism association, the discussion around the potential link has contributed to vaccine hesitancy".