# A nurse is assessing a child for possible measles. Which assessment finding would be most characteristic of measles in the early stages?

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=541884  
> language: ko  
> subject: Infectious Diseases

## 문제

A nurse is assessing a child for possible measles. Which assessment finding would be most characteristic of measles in the early stages?

A 4-year-old child presents with fever, coryza, and cough for 3 days. The parents report the child has not received MMR vaccination due to personal beliefs. What early sign should the nurse prioritize in the assessment for measles?

## 보기

1. Koplik's spots on the buccal mucosa **✔ 정답**
2. Fine, sandpaper-like rash on the trunk
3. Swollen parotid glands with jaw pain
4. Posterior cervical lymphadenopathy with rash behind ears

**정답: 1**

## 해설

Koplik's spots are pathognomonic for measles, appearing 1-2 days before the rash. Other options describe signs of other diseases (scarlet fever, mumps, rubella).

## 심화 해설

Clinical Judgment
This question assesses your ability to distinguish between early detection of infectious diseases and characteristic symptoms. The key is the keywords "early stages" and "most characteristic." Fever, runny nose, and cough are nonspecific symptoms that cannot be distinguished from a cold or other viral infections. Therefore, you must identify the pathognomonic sign that can confirm measles at this nonspecific symptom stage. Koplik's spots are a highly specific sign that appears on the oral mucosa 1-2 days before the measles rash, playing a decisive role in early diagnosis and isolation decisions.

Memory Tip
Recall the "**3C + K**" mnemonic for the initial symptoms of measles: **C**ough, **C**oryza, **C**onjunctivitis, and **K**oplik's spots. Remember Koplik's spots as "Intraoral **K**oplik's, the **K**ey sign before the rash."

KR vs US
In Korea, the high MMR vaccination rate means opportunities to encounter measles patients are relatively rare, but in the US NGN exam, infection cases due to vaccine hesitancy are an important topic. Also, in the US, measles is a immediately notifiable and isolatable disease, making it crucial from a public health perspective for nurses to recognize the early signs.

## 임상 시나리오

Clinical Practice Guide
When evaluating a patient suspected of having measles, thoroughly examine the oral mucosa (especially the buccal area opposite the molars) in a well-lit environment. Koplik's spots are described as looking like "salt grains on a red background." As soon as they are detected, initiate standard plus droplet isolation precautions, report to the physician, and begin the notification process to the local health authority.
Caution
In SATA (Select All That Apply) questions asking about measles symptoms, fever/cough/runny nose/conjunctivitis and Koplik's spots can all be correct answers. However, in single-answer questions asking for the "earliest characteristic sign" or "pathognomonic sign," you must select Koplik's spots. The other options are traps that can be easily confused with other diseases (scarlet fever, mumps, rubella).

## 핵심 개념

- **Koplik's spots** — Pathognomonic sign of measles. Small bluish-white spots appearing on the buccal mucosa (mainly opposite the molars) 1-2 days before the rash develops, with a red background and a "salt sprinkled" appearance.
- **Maculopapular Rash** — A rash with a mix of papules and macules. This is the characteristic rash pattern of measles, starting on the face and upper body and spreading to the lower body, and after fading, pigmentation and fine scaling may occur.
- **Prodromal Phase (Catarrhal Stage)** — Prodromal (catarrhal) stage. This is the 2-4 day period before the measles rash appears, characterized by nonspecific symptoms such as high fever, cough, runny nose, and conjunctivitis, along with Koplik's spots. This stage is the most contagious.
- **MMR Vaccine** — Measles, Mumps, and Rubella (MMR) vaccine, a 3-in-1 combination vaccine. It is typically administered at 12–15 months and 4–6 years of age. Vaccine hesitancy is a major risk factor for measles outbreaks.
- **Pathognomonic Sign** — Pathognomonic sign. A highly specific symptom or sign that appears only in a particular disease, allowing for its definitive diagnosis. Koplik's spots are considered a pathognomonic sign of measles.

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