The parents of seven-year-old Jack Gorrod are suing the vaccine company they say left him severely disabled after a routine jab.
According to David and Louise Gorrod, Jack was left autistic and epileptic after the measles, mumps and rubella injection a the age of 14 months.
Before that, they claim, he was a normal and healthy child, but the complications have left him dependent on a tube for food.
Now they are joining 14 other sets of parents nationwide who believe their children were damaged as a result of the MMR vaccine.
Mother-of-three Louise, of Moor Avenue, Witney, said: "He was fine until the injection. Then things went downhill overnight. We have videos of him as a normal little boy. He went from being potty-trained back to having to wear a nappy. He went from eating normally to eating hardly anything at all."
Jack lives at home with his parents and sisters, Jade, eight, and Jemma, 11.
Louise said he developed autism three months after the MMR jab and now attends Springfield special school in Witney.
She said: "They are brilliant, fantastic with him. But our family life has been severely disrupted and Jack will need care well into the future.
"It was very difficult trying to explain to our other two children why he began to behave like he did, pinching them or screaming in the shops."
Jack is one of 15 children going to the High Court to claim more than £50,000 damages for personal injury.
Manchester solicitor Alexander Harris is co-ordinating the case against MMR manufacturers Merck and Co Inc, which is contesting the claim.
As a result of her experiences, Mrs Gorrod has written a book to help siblings to understand autism.
**My Brother is Different is available from the National Autistic Society.
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