Childhood Diseases

Posted by: Syl | 2010/04/26


Measles vaccine at 9 months and MMR at 15 months

Dear Doc

When my daughter received her vaccine for measles at 9 months, she never got any rash. When she got her 15 months MMR vaccine, she got a very distinct rash. Why would she not have got the rash at 9 months then - could the 9 month vaccine possibly not have worked?

Thank you.

Expert's Reply



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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user comments


Posted by: Purple | 2010/04/26

I don''t think that children always have a reaction to a vaccine, my son has thankfully never reacted to one, apart from feeling a bit grotty on the day for which I" ve given panado. He didn''t get a rash with measles or MMR or the MMR at 6 years old.

It is odd that she got a rash with the MMR and not the measles one, but perhaps it also depends on how her body was feeling on the day of the vaccine or the week or two afterwards. Maybe the MMR uses something as a preservative that the measles on its own doesn''t use, though as far as I know its the same for both.

I thnk it''s always possible that a vaccine might not work as with everything you can get faulty batches or things might not have been stored properly and so on.

Reply to Purple

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