What is a contraindication for the inactivated influenza vaccine?

A severe allergic reaction to eggs is a recognized contraindication for the inactivated influenza vaccine due to the vaccine's production process. The inactivated influenza vaccine is prepared using virus strains grown in eggs, which means that trace amounts of egg proteins may be present in the final product. Individuals who have a history of severe allergic reactions, such as anaphylaxis, specifically related to egg consumption are at heightened risk when receiving this vaccine, making it necessary to avoid administering it in such cases.

In contrast, other allergies, such as to neomycin or gelatin, do not typically present a significant risk with this vaccine, and a sore arm from a previous vaccination is a common and mild side effect that does not contraindicate future vaccinations.