Allergic individuals who are allergic to the ingredients in the vaccine and have severe allergies should not be vaccinated. If the allergy is only mild, the vaccine can be administered after assessment by a doctor. Allergic constitution belongs to a kind of idiosyncratic constitution formed on the basis of congenital heredity. Vaccines refer to biological products used to prevent various types of pathogenic microbial infections. Determining whether an allergic body can be vaccinated depends on the actual situation. If an allergic person is allergic to a component in a vaccine that needs to be vaccinated, and the allergic reaction is severe, the vaccine cannot be administered. However, if the allergic person is not allergic to the ingredients in the vaccine to be vaccinated, but only shows mild allergic manifestations after vaccination, it is usually possible to delay vaccination after doctor’s assessment. All in all, people with allergies need to strengthen their daily life management, do a good job of personal protection, and consult the physician at the vaccination site before vaccination.