Koplik's spots can be observed in:-

Appeared in: AIIMS Manglagiri NO - 2019

Explanation

Koplik's spots are a pathognomonic enanthem (rash on mucous membranes) of measles (rubeola).
They are characteristically found on the buccal mucosa, which is the inner lining of the cheeks, typically opposite the first and second molars.
These spots appear 1-2 days before the onset of the characteristic maculopapular skin rash of measles.
They are described as small, bluish-white spots surrounded by a red halo, resembling grains of salt on a red background.

Option B: The neck is one of the first places the maculopapular skin rash (exanthem) of measles appears, but Koplik's spots, which are an enanthem, do not appear on the skin of the neck.
Option C: The chest and abdomen are areas where the measles rash spreads after appearing on the face and neck. Koplik's spots are confined to mucous membranes, primarily the mouth.
Option D: Koplik's spots are an enanthem, meaning a rash inside the body on mucous membranes. The characteristic measles rash that appears on the skin is an exanthem and is a different clinical sign.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Identification of the location of Koplik's spots in measles as background academic context rather than a clinical decision trigger.
Identifying Koplik's spots is crucial for early diagnosis of measles, often before the full-blown rash appears, allowing for prompt implementation of isolation precautions to prevent transmission.
Early diagnosis enables timely reporting to public health authorities, which is essential for outbreak investigation and control.
What if? If a patient presents with fever and a rash but no Koplik's spots are observed, the diagnosis might be a later stage of measles (after the spots have faded) or another viral exanthem like rubella or roseola, requiring further diagnostic evaluation.

How to Approach the Question

First, identify the key term in the question: 'Koplik's spots'.
Recall the definition and clinical characteristics of this specific sign. This is a factual recall question.
Associate Koplik's spots with the disease it signifies, which is measles (rubeola).
Remember that Koplik's spots are an 'enanthem,' meaning a rash on the mucous membranes, not the skin ('exanthem').
Evaluate the options based on this knowledge. 'Oral mucosa' is the only mucous membrane listed and is the classic location for these spots.

Concept Tested & Keywords

Qzxg-yZCwtvXSG-RC53BgA

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

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