DS2 is due to have his MMR vaccine soon. I know that one ingredient of the vaccine is lactose and DS2 has a cows milk allergy. I know that cows milk allergy is a reaction to milk protein not lactose, but still it worries me in case the vaccine could be contaminated with milk protein. What have others done with dairy allergic children and MMR? Have the injection? Have it in hospital? Or do the single vaccines not contain lactose?