Hello, my 3 year old little boy (T) has recently been diagnosed with autism. He had his MMR jab as planned. I have just been asked to make an appointment for his MMR booster (he has to have it before he starts school next September) A good few years ago it was suggested that there was a link between a child having the MMR and developing austim. This was later discredited and I accepted that, hence why T had the MMR. However, I am very anxious about T having the MMR booster if there is the slightest chance that it may cause a reaction in T which could make his autism more severe (we are very fortunate that at the moment it is relatively mild). I would really welcome feedback from parents or carers of children with autism who have had the MMR and MMR booster about whether they have noticed any change/deperioration in their child after having the MMR booster. Please don't think that I am being overdramatic about this, but I am just trying to do my research (I fear that medics will just give the 'official party line view') and I just don't want to risk doing anything that could make T's autism worse. I have looked into single injections but the single mumps vaccine is no longer available and so I cannot do this. If I could have done, I certainly would have. Thank you very much, Sally