A nurse is assessing a patient with suspected measles. What is a classic sign of measles that can be identified during a physical exam?

Appeared in: NORCET 7 Prelims -2024

Explanation

Koplik spots are a pathognomonic sign of measles (rubeola), meaning they are uniquely characteristic of the disease.
They appear as small, bluish-white spots on a red base on the buccal mucosa (inside the cheeks), typically opposite the molars.
Their appearance during the prodromal stage, 1-2 days before the main rash, makes them a key early diagnostic indicator.

Option B: While a key feature of measles, this type of rash is not specific and can be seen in other viral illnesses like rubella and roseola.
Option C: This is a classic sign of Scarlet fever and Kawasaki disease, not measles.
Option D: This is a general sign of pharyngitis or tonsillitis and is not specific to measles.

Visual 1: Image: Close-up view of the inside of a cheek showing Koplik spots, highlighting their bluish-white appearance on a red background.
Visual 2: Chart: Timeline of measles symptoms, showing the appearance of Koplik spots in the prodromal phase followed by the maculopapular rash.

Clinical Relevance

Nursing practice connection: Use the key finding related to Identification of pathognomonic signs of measles to guide bedside assessment, documentation, and the next nursing action.
Early identification of Koplik spots allows for prompt implementation of airborne precautions, which is critical to prevent the spread of the highly contagious measles virus in a clinical setting.
A nurse's ability to differentiate measles from other exanthematous diseases based on specific signs like Koplik spots prevents misdiagnosis and ensures appropriate public health reporting and contact tracing.
What if? If the patient was already vaccinated for MMR (Measles, Mumps, Rubella), the suspicion for measles would be lower, and other diagnoses like hand-foot-and-mouth disease (which can also have oral lesions) or an atypical drug reaction would be more strongly considered.

How to Approach the Question

First, identify the core question, which asks for a 'classic sign' of measles. The word 'classic' often points to a pathognomonic sign—one that is uniquely characteristic of a specific disease.
Review the options. Think about which sign is most specifically associated with measles versus signs that are more general or associated with other conditions.
Evaluate 'Koplik spots'. Recall that this is the hallmark sign of measles.
Evaluate 'Maculopapular rash'. While measles has this rash, many other viral illnesses do too, so it's not as 'classic' or specific.
Evaluate 'Strawberry tongue' and 'Red, swollen tonsils'. Associate these with their respective common conditions (Scarlet fever/Kawasaki disease and pharyngitis/tonsillitis).
Conclude that Koplik spots are the most specific and classic diagnostic sign among the choices.

Concept Tested & Keywords

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Practise the full NORCET 7 Prelims -2024

Attempt every question from this paper in a timed mock, then review the full solution for each one.