This is an interesting question.The measles vaccination at 9 months is only for measles and is a pure measles vaccine. The MMR vaccination given at 15 months is for Measles, Mumps and Rubella [MMR] Rubella ia another name for German measles. The most likely cause of the rash your baby developed at 15 months when she was given the MMR is the Rubella/German measls part of the vaccination.
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