# A nurse is preparing to administer the MMR (measles, mumps, rubella) vaccine to a 15-month-old child. Upon opening the refrigerator, the nurse discovers that the temperature log shows the refrigerator temperature was 45°F (7.2°C) for the past 8 hours due to a malfunction. What is the most appropriate nursing action?

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=541929  
> language: ko  
> subject: Infectious Diseases

## 문제

A nurse is preparing to administer the MMR (measles, mumps, rubella) vaccine to a 15-month-old child. Upon opening the refrigerator, the nurse discovers that the temperature log shows the refrigerator temperature was 45°F (7.2°C) for the past 8 hours due to a malfunction. What is the most appropriate nursing action?

## 보기

1. Contact the vaccine manufacturer or health department for guidance on vaccine viability and document **✔ 정답**
2. Administer the vaccine as scheduled since it was only exposed to elevated temperature for 8 hours
3. Discard the vaccine immediately and order a new supply from the pharmacy
4. Store the vaccine in the freezer to restore proper temperature before administration

**정답: 1**

## 해설

For vaccine temperature deviations, consult the manufacturer or health department to assess viability before use. Administering, discarding, or freezing without guidance can compromise safety and efficacy.

## 심화 해설

Clinical Judgment
This question evaluates the nurse's clinical judgment regarding vaccine safety management and protocol adherence. The core principle, similar to Notify HCP!, is to report to a higher authority and receive instructions according to established guidelines rather than making an independent decision without authorization. The MMR vaccine is a live attenuated vaccine and is sensitive to temperature fluctuations. Although the refrigerator temperature rose to 45°F (7.2°C), this is very close to the upper limit of the recommended range (2-8°C). Therefore, simply discarding it or using it as is would not be appropriate. The safest and most standardized action is to contact the manufacturer or the health department to receive official guidance specific to the situation (exposure time, temperature, vaccine type).

Memory Tip:
**D**on't **A**ssume, **C**all for **V**accine viability (**DACV**). When a temperature excursion occurs, don't assume (D), call an expert (C) to check the vaccine's viability (V).

KR vs US:
While monitoring vaccine storage temperature is also important in Korea, the US NGN/CJMM emphasizes the nurse's **systematic protocol and collaborative decision-making over independent judgment** in such system error situations. In Korean practice, the first report might often be made to the pharmacy or a manager according to the institution's internal guidelines, but in the NGN, contacting the manufacturer or a public health agency (CDC, health department) directly is presented as the standard answer.

## 임상 시나리오

Clinical Practice Guide
Standard procedure for vaccine storage temperature excursion: 1) Isolate the affected vaccine separately and stop its use, 2) Document the incident (temperature, duration, vaccines involved), 3) Immediately report to the manager (or pharmacy) and the health department/manufacturer, 4) Act according to guidance (use, discard, further testing, etc.). Temperature logs must be checked daily.
Caution:
In SATA (Select All That Apply) questions, the option "discard the vaccine immediately" is a **common trap**. Not all temperature excursions mean automatic disposal. Conversely, the option "administer as scheduled" is a **dangerous action that ignores patient safety** and can lead to vaccine failure.

## 핵심 개념

- **MMR Vaccine** — This is a combined vaccine of three live attenuated viruses that prevents measles, mumps, and rubella. Refrigerated storage (2–8°C) is essential, and it must not be frozen.
- **Temperature Deviation** — A situation where the vaccine storage temperature goes outside the recommended range. This is a critical medication safety event that can impair the vaccine's potency, requiring immediate reporting and evaluation.
- **Vaccine Viability** — The ability of a vaccine to induce the expected immune response. After a temperature excursion, viability must be assessed according to the manufacturer's or health authority's guidelines.
- **Live Attenuated Vaccine** — Vaccines containing live attenuated pathogens (e.g., MMR, varicella vaccine). They elicit a strong immune response but are sensitive to temperature and light, making storage conditions very critical.
- **Protocol** — Standardized action guidelines to be followed in specific clinical situations (e.g., temperature deviation). Nurses must know and adhere to the protocol to ensure patient safety and provide standard nursing care.

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