Childhood Diseases

Posted by: KC | 2012/03/14


Allergic reaction, virus or reaction to MMR.

Hi Dr,
What is your opinion on the following, my 15 month old had his MMR about three weeks ago. Two days after the MMR he got croup. He was put on antibiotics and cortisone and recovered quickly. A week later (roughly two weeks from the MMR) he developed a temp of 38.5. I gave him a ponstan suppository and a few hours later he had no fever, no symptoms of being ill. Perfectly healthy. About a week after that, he developed what looked like a heat rash on his upper back and chest. A day later the rash got worse, spread to his waist (no rash in the middle of his tummy or back), under the arms, behind his ears, all along his hairline and around his eyes. The rash looked like a combination of a heat rash and eczema - fine red spots with inflamed skin, I did not think the rash looked like roseola as I have seen it before. He has glands behind his head which are easy to feel and these were swollen too. No sign of illness or fever though. I took him to the chemist who said it could be a allergic reaction or something viral. He was given allergex and the rash got better quite quickly but did not entirely go away. The spots and redness around the eyes cleared up as well as the hairline but he still had a few spots on his neck and back. To my knowledge, he had no new foods and was not exposed to anything out of the ordinary. If it was a allergic reaction is it anything to be concerned about? My concern is that if it was a allergic reaction and happens again it could be worse?
Thank you in advance for your advice. I appreciate your opinion.

Expert's Reply



Thank you.Your son's croup was definitely not related to his MMR 2 days earlier. However his illness about a week later was most probably a mild form of rubella [german measles] or measles. His rash was very typical of both especially the rash behind his ears.Of the two illnesses, german measles is more likely especially as he had swollen glands behind his ears and neck.This can occasionally happen following the MMR vaccination. This is definitely not an allergy.

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user comments


Posted by: Purple | 2012/03/14

A rash about ten days to two weeks after a measles or MMR vaccination is one of the m ore common side effects of the vaccine. It doesn''t however happen that often, but I have been warned about it every time by the clinic sister.

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