There has been a longstanding controversy over the measles, mumps and rubella (MMR) vaccine in children with an egg allergy. The live measles and mumps vaccines are grown on cultured chick fibroblasts and the concern has been that the MMR vaccine contains egg protein. The amount of ovalbumin-like protein within the vaccine is extremely low (approx. 37 pg per dose) and is highly processed. While initially it was recommended that only children with a mild egg allergy could be safety vaccinated in primary care with the MMR vaccine. Multiple studies subsequently have shown that the MMR vaccine has an excellent safety record in children with an egg allergy. As such, the current BSACI recommendations are that all children with an egg allergy should have their MMR vaccine in primary care.