What are Koplik’s spots?

Appeared in: BTSC 3 August 2025

Explanation

Koplik's spots are a classic and pathognomonic sign of measles (rubeola).
They are described as tiny, bluish-white spots on a red background, resembling grains of salt.
These spots appear on the buccal mucosa (inner cheek lining), typically opposite the lower molars.
Crucially, they manifest during the prodromal stage, about 1-2 days before the onset of the characteristic maculopapular skin rash, making them an early diagnostic marker.

Option B: This describes Roth spots, which are retinal hemorrhages with pale centers.
Option C: This describes Janeway lesions, which are painless, flat, reddish macules.
Option D: This describes Osler's nodes, which are painful, raised lesions.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Clinical Manifestations of Measles as background academic context rather than a clinical decision trigger.
Recognizing Koplik's spots is a critical nursing skill as it allows for the early suspicion of measles, a highly contagious disease. This enables prompt implementation of airborne precautions to prevent transmission in a healthcare setting.
Early diagnosis helps in initiating supportive care and monitoring for complications like pneumonia, encephalitis, and diarrhea, which are major causes of measles-related morbidity and mortality.
What if? If a child presents with a high fever and rash but lacks Koplik's spots, cough, coryza, and conjunctivitis, the nurse should consider other differential diagnoses like rubella, roseola (exanthem subitum), or Kawasaki disease, as the classic measles presentation is less likely.

How to Approach the Question

First, identify the key term in the question: 'Koplik’s spots'.
This is a factual recall question that tests your knowledge of specific clinical signs of infectious diseases.
Recall the disease associated with Koplik's spots. You should remember this is a pathognomonic (uniquely characteristic) sign of measles.
Evaluate each option based on the classic description of Koplik's spots: location (buccal mucosa), appearance (tiny white spots), and timing (before the rash).
Option A perfectly matches this description. The other options describe signs (Roth spots, Janeway lesions, Osler's nodes) associated with a different condition, infective endocarditis.

Concept Tested & Keywords

QILq78FxBtQW2kkzEeDd_q

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. 1964-1966

Practise the full BTSC 3 August 2025

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