"Koplik's Spot" are the features of which disease in children?

Appeared in: UPPSC 2022

Explanation

Koplik's spots are the pathognomonic sign of measles (rubeola), meaning their presence confirms the diagnosis.
These spots are described as small, bluish-white lesions surrounded by erythema (redness).
They typically appear on the buccal mucosa, opposite the lower molars, about 1-2 days before the onset of the characteristic maculopapular skin rash.
The appearance of Koplik's spots coincides with the prodromal phase of measles, which also includes fever, cough, coryza (runny nose), and conjunctivitis (the '3 Cs').

Option B: Chickenpox is characterized by a vesicular rash, often described as 'dewdrops on a rose petal,' which appears in successive crops. It does not cause Koplik's spots.
Option C: German measles (rubella) can present with spots, but they are called Forchheimer spots—small, red petechiae on the soft palate. These are different in appearance and location from Koplik's spots.
Option D: Smallpox, an eradicated disease, was characterized by a severe rash of deep-seated pustules that were all in the same stage of development simultaneously. It did not present with Koplik's spots.

Clinical Relevance

Nursing practice connection: Knowing Pathognomonic signs of childhood exanthems (rashes) helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Early identification of Koplik's spots is critical for nurses as it allows for prompt implementation of airborne precautions to prevent the spread of the highly contagious measles virus.
The diagnosis of measles prompts the administration of Vitamin A, especially in resource-limited settings, as it has been proven to reduce morbidity and mortality.
A nurse's role includes educating parents about the importance of the MMR (Measles, Mumps, Rubella) vaccine as a safe and effective primary prevention strategy.

How to Approach the Question

First, identify the key term in the question stem: 'Koplik's Spot'. This is a specific clinical sign.
This is a factual recall question. Access your knowledge base of infectious diseases and their pathognomonic (uniquely characteristic) signs.
Associate 'Koplik's Spot' with its corresponding disease. Recall that these spots are a hallmark of measles (rubeola).
Evaluate the other options to confirm your answer. Differentiate the signs of chickenpox (vesicular rash), German measles (Forchheimer spots), and smallpox (synchronous pustules) from Koplik's spots.
Select the option that correctly links the sign to the disease.

Concept Tested & Keywords

QMrs2yfyzHYuz55a2uLMBu

E6 Medicine Harrison 22e Part 1 p. 1682-1684

E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart A (pp 26-201 of 604) p. 150-152

E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 1965-1967

Practise the full UPPSC 2022

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