Parents actively vaccinate their children in a timely manner for the sake of their children’s health, and many vaccines are effective in preventing the occurrence of diseases that were once prevalent but are now well controlled because of vaccination. Many parents struggle with whether or not to vaccinate their children before receiving the measles vaccine because they have an egg allergy. This is because many vaccinators require that children have eaten eggs to verify whether they are allergic to eggs before receiving measles-type vaccines. In fact, it is not necessary to eat eggs before getting the measles vaccine, but children need special attention if they are allergic to eggs. First, it is important to understand why there is a recommendation to eat eggs before a leprosy vaccination. In the leprosy vaccine, the measles component comes from chicken embryo cell culture, which is mechanically understood to be contraindicated for those allergic to eggs. In the instructions for use of the MMR vaccine from Schick’s, it is stated that individuals who may have egg protein residues and who have had an acute allergic reaction to egg ingestion (e.g., generalized urticaria, oropharyngeal edema, dyspnea, hypotension, or shock) may be at increased risk of developing a tachyphylactic hypersensitivity reaction when vaccinated. Special care should be taken when vaccinating individuals who have experienced allergic reactions to egg ingestion. There are three points to note in the Schick’s instructions: 1. It is stated that egg protein may be included in the ingredients of measles vaccine; 2, 3. When it comes to egg allergy, special attention should be paid when vaccinating against leprosy. The manual of Schick & Co. has a thorough analysis of egg allergy, stating the possible egg protein components and the possibility of allergy risk. Therefore, eating eggs before leprosy vaccination is to prevent adverse reactions after vaccination as well as the effect of vaccination due to allergy to eggs.