The active ingredient of the MMR vaccine is not the same antigen as egg, and people who are allergic to egg are usually able to receive the MMR vaccine.
The main ingredient of the MMR vaccine is made from chicken embryo fibroblasts, which is not the same substance as the ovalbumin in eggs. Therefore, patients who are allergic to eggs will not have allergic symptoms when they receive the MMR vaccine. Therefore, people who are allergic to eggs can get the MMR vaccine.
However, it should be noted that if the patient is in the attack of allergy, accompanied by a rash or fever and other symptoms, it is generally recommended to wait until the symptoms subside and the allergy is relieved before vaccination. And should avoid bathing on the day of vaccination to prevent wound infection.