March 2026

Volume 12 - Issue 01

Do egg allergies still matter for vaccination decisions?

Health authorities and recent clinical evidence indicate that egg allergy should no longer be considered a routine concern when administering the most common vaccines, easing long-standing immunization precautions.

For vaccines such as influenza, measles, mumps, rubella (MMR), and rabies, experts have for several years advised that patients do not need to be screened for egg allergy prior to vaccination. Studies show that while these vaccines may contain trace amounts of egg protein, the levels are too low to trigger allergic reactions, even in individuals with known egg allergies.

Recent research has extended this reassurance to the yellow fever vaccine.

In the largest study conducted to date, 171 children with egg allergies, including nearly a quarter with a history of anaphylaxis, were safely vaccinated against yellow fever.

Participants underwent skin testing before vaccination, but no allergic reactions were observed regardless of test outcomes.

Despite these findings, current guidelines from the U.S. Centers for Disease Control and Prevention (CDC) and vaccine manufacturers continue to list the yellow fever vaccine as contraindicated for individuals with a history of severe hypersensitivity to egg proteins or related products.

However, milder or localized egg or feather allergies are not considered a barrier to vaccination and typically do not require prior skin testing.

Experts note that while new evidence is encouraging, additional data are still needed before official recommendations are fully updated.

References

• 1 Practice Changing Updates, UpToDate, February 2025: https://www.uptodate.com/contents/practice-changing-updates
• 2 Medicines Information Centre, University of Cape Town: https://mic.uct.ac.za/articles/2025-04-24-egg-allergy-and-vaccines
• 3 International Archives of Allergy and Immunology: https://karger.com/iaa/article-abstract/186/1/52/911605/No-Yellow-Fever-Vaccine-Reactions-in-IgE-Mediated?redirectedFrom=fulltext