Quick Answer
Egg allergy affects approximately 1.3–2% of children and is the second most common food allergy after milk. It is caused by IgE antibodies to egg white proteins including ovomucoid and ovalbumin. Approximately 70% of children outgrow egg allergy by age 16. Children who tolerate baked egg tend to outgrow the allergy faster.
Egg Allergen Proteins: Ovomucoid vs Ovalbumin
Egg white contains the major allergens. Ovomucoid (Gal d 1) is the dominant egg allergen and is highly heat-stable — it survives baking at high temperatures. High ovomucoid IgE levels predict persistent egg allergy and reaction to baked egg forms. Ovalbumin (Gal d 2) is partially heat-labile — it is partially denatured by extensive heating, making some patients tolerant of well-baked egg while reacting to lightly cooked or raw egg.
Egg yolk contains fewer allergenic proteins than egg white, and rare patients react specifically to egg yolk (particularly alpha-livetin/Gal d 5, which can cross-react with bird-egg syndrome in patients who keep birds). Most egg-allergic patients react to egg white, and egg yolk may sometimes be tolerated after allergist evaluation.
Baked Egg Tolerance and Accelerating Resolution
Approximately 70–80% of egg-allergic children can tolerate egg in an extensively baked form (heated to 180°C for 30 minutes), such as muffins, bread, or cookies. This is because heating denatures the heat-labile fraction of egg allergens (mainly ovalbumin), leaving less intact allergen to bind IgE. Ovomucoid-sensitized patients are more likely to react to baked egg.
Studies show that regularly consuming baked egg forms that are tolerated accelerates development of full egg tolerance. Children who can eat baked egg should be encouraged to do so regularly as part of a tolerance induction strategy. An allergist should supervise the first introduction of baked egg and can track whether progression to less baked or raw egg is appropriate over time.
Egg Allergy and Vaccines
The influenza (flu) vaccine is the most relevant vaccine concern for egg-allergic patients because it is manufactured in hen's eggs and may contain trace egg protein (ovalbumin). Current CDC and ACAAI guidelines state that egg-allergic individuals can safely receive influenza vaccine in any setting — even those with a history of severe egg allergy reactions — without special precautions beyond standard vaccine observation.
The yellow fever vaccine contains a higher amount of egg protein and should be administered only in a supervised medical setting for patients with egg allergy, with a 30-minute observation period. The MMR vaccine, contrary to popular belief, is not manufactured in eggs and is safe for egg-allergic patients without special precautions.
Hidden Egg Sources and Avoidance
Egg appears in expected places (pasta, baked goods, custard, aioli, mayonnaise) and unexpected ones. Restaurant foods including breaded items, egg washes on baked goods, and binding agents in meat products may contain egg without obvious labeling. Foam in cocktails is often made from dried egg white (aquafaba is an egg-free alternative). Wine and beer fined with egg albumen may contain trace proteins.
Ingredient label names for egg include albumin, globulin, lecithin (if egg-derived), lysozyme, mayonnaise, meringue, ovalbumin, ovomucin, ovovitellin, and silici albuminate. Under FALCPA, 'egg' must be declared on all US food labels when egg or egg-derived ingredients are present.
Key Takeaways
- Egg allergy affects 1.3–2% of children; ~70% outgrow it by age 16.
- Ovomucoid is the major heat-stable egg allergen; ovalbumin is partially heat-labile.
- Baked egg tolerance predicts faster allergy resolution — regularly eating tolerated baked egg accelerates progress.
- Egg-allergic patients can safely receive influenza vaccines without special precautions per current guidelines.
- Egg appears under many ingredient names — albumin, lysozyme, globulin, meringue, ovalbumin.
Related Guide
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