3 years ago we decided to pay to have our son vaccinated with the single measels vaccine. There is autism in our family and I guess we were a little concerned. I am now more confident and had our daughter vaccinated with the MMR. A day after the vaccine my sone broke out in hives all over his body. We took him to OH doctor who gave him Piriton and it calmed down. I have been nervous about now giving him the MMR vacccine. Did anyone else have this problem after the vaccine. The doctor we saw said the hives could be due to the body fighting the virus.