The MMR is one of a few vaccines that contains egg protein, and despite a recent study claiming that it is safe to give the MMR to children with egg allergies, children who are allergic or sensitive to eggs still have significant inflammatory reactions after the injection of the MMR. The lack of an anaphylactic response in children who ingest egg protein after they've been sensitized by an injection of egg protein in the MMR, does not mean they lack a reaction to, or lack the development of inflammatory symptoms as a result of the injection and ingestion of egg protein.