# A 4-year-old child is brought to the pediatric clinic for routine immunizations. The child has a history of severe allergic reaction to eggs. Which immunization should the nurse question before administration?

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## 문제

A 4-year-old child is brought to the pediatric clinic for routine immunizations. The child has a history of severe allergic reaction to eggs. Which immunization should the nurse question before administration?

## 보기

1. Influenza vaccine **✔ 정답**
2. MMR vaccine
3. DTaP vaccine
4. Varicella vaccine

**정답: 1**

## 해설

Influenza vaccine is contraindicated due to egg-based manufacturing and potential for severe allergic reactions in children with documented egg allergy. MMR vaccine is now considered safe despite historical concerns, and DTaP and varicella vaccines contain no egg proteins.

## 심화 해설

Understanding the Contraindication

The core of this question lies in understanding vaccine contraindications for patients with egg allergies. The Advisory Committee on Immunization Practices (ACIP) guidelines explicitly address this. While most vaccines are safe for individuals with egg allergies, the influenza vaccine requires special consideration because most formulations are produced using an egg-based manufacturing process, which can leave trace amounts of egg protein (ovalbumin) in the final product [1,2]. A history of a severe allergic reaction (e.g., anaphylaxis) to eggs is a contraindication for receiving any egg-based influenza vaccine, whether it is an inactivated (IIV) or live attenuated (LAIV) formulation [1,2]. Therefore, the nurse must question this order to prevent a potentially life-threatening hypersensitivity reaction.

Why Not the Other Vaccines?

It is a common misconception that the MMR (Measles, Mumps, and Rubella) vaccine is contraindicated in egg-allergic individuals. This is not supported by evidence. The MMR vaccine is produced in chick embryo fibroblast cell cultures, not in the egg itself, and contains negligible amounts of egg protein that are not sufficient to trigger an allergic reaction, even in those with a severe egg allergy [3]. The DTaP (Diphtheria, Tetanus, and acellular Pertussis) and Varicella vaccines are not manufactured using egg products and are considered safe for administration to patients with egg allergies [3].

Clinical Application and Safe Alternatives

When a child with a severe egg allergy requires influenza vaccination, the nurse’s role is to advocate for a safe alternative. The ACIP guidelines state that for the 2025-26 influenza season, two non-egg-based vaccine options are available: the trivalent recombinant influenza vaccine (RIV3) and cell culture-based inactivated influenza vaccines (ccIIV3) [1]. The recombinant vaccine (RIV3) is produced without the use of eggs and contains no egg protein, making it a safe option for individuals with a history of severe allergic reactions to eggs [1,2]. The nurse should question the initial order and collaborate with the healthcare provider to ensure one of these safe alternatives is prescribed instead [3].References (research sources)

- [1]Prevention and Control of Seasonal Influenza with Vaccines: Recommendations of the Advisory Committee on Immunization Practices - United States, 2025-26 Influenza Season.GuidelineGrohskopf LA, Blanton LH, Ferdinands JM, Reed C, Dugan VG, Daskalakis DC. (2025) · DOI: 10.15585/mmwr.mm7432a2

- [3]Allergic Reactions to Vaccines in Children: From Constituents to Specific Vaccines.Research articleTsai MH, Chiu CY. (2023) · DOI: 10.3390/biomedicines11020620

## 임상 시나리오

Influenza Vaccine & Egg AllergyACIP Contraindication Guidance
A history of a severe allergic reaction (e.g., anaphylaxis) to eggs is a contraindication for any egg-based influenza vaccine (IIV or LAIV). Most formulations are produced using an egg-based process and contain trace ovalbumin.

The MMR vaccine is produced in chick embryo fibroblast cultures, not in eggs, and is safe even with a severe egg allergy. DTaP and Varicella vaccines are not manufactured using egg products and are safe.

CautionAlways screen for allergy severity. A severe reaction requires the nurse to question the order before administration. For patients with egg allergy and a non-severe reaction (e.g., hives only), the inactivated influenza vaccine can be administered with a 30-minute observation period.

## 핵심 개념

- **Ovalbumin** — The major protein found in egg white, trace amounts of which can be present in egg-based influenza vaccines and trigger allergic reactions.
- **Anaphylaxis** — A severe, potentially life-threatening systemic hypersensitivity reaction that is a contraindication for receiving egg-based vaccines.
- **Contraindication** — A condition or factor that serves as a reason to withhold a certain medical treatment due to the harm that it would cause the patient.
- **ACIP** — Advisory Committee on Immunization Practices, the body that provides vaccine recommendations and guidelines in the United States.
- **Chick Embryo Fibroblast Culture** — The cell culture method used to produce the MMR vaccine, which does not involve the egg itself and yields negligible egg protein.

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