Which disease is Koplik spots a key symptom of?

Appeared in: MP CHO -2019 (Shift-1)

Explanation

Koplik spots are the pathognomonic sign of measles, meaning their presence is virtually diagnostic for the disease.
These spots are small, bluish-white lesions on a red background, often described as resembling grains of salt.
They typically appear on the buccal mucosa (inside the cheeks) opposite the molars, 1-2 days before the main body rash begins.
The classic measles prodrome also includes the '3 Cs': cough, coryza (runny nose), and conjunctivitis.

Option B: Chickenpox (varicella) is characterized by an itchy, vesicular rash (fluid-filled blisters) that appears in successive crops. It does not cause Koplik spots.
Option C: Typhoid fever's characteristic rash consists of 'rose spots,' which are faint, salmon-colored macules typically found on the trunk (abdomen and chest), not spots inside the mouth.
Option D: Mumps is characterized by painful swelling of the parotid glands (parotitis), leading to swollen cheeks and jaw. It is not associated with Koplik spots.

Clinical Relevance

Nursing practice connection: Knowing Pathognomonic signs of communicable diseases helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Early identification of Koplik spots allows nurses to implement airborne precautions immediately, which is critical for preventing the spread of the highly contagious measles virus in a clinical setting.
Nursing care for a patient with measles includes administering prescribed Vitamin A, providing supportive care for fever and hydration, and diligently monitoring for serious complications like pneumonia, encephalitis, and otitis media.
What if? If a patient has a fever and rash but lacks the '3 Cs' (cough, coryza, conjunctivitis) and Koplik spots, the nurse should consider differential diagnoses such as rubella, roseola, or a drug reaction, as the classic measles presentation is absent.

How to Approach the Question

Identify the key clinical sign mentioned in the question: 'Koplik spots'.
Recognize that this is a factual recall question testing knowledge of pathognomonic signs (signs that are specific to a single disease).
Access your knowledge base to link the specific sign to its corresponding disease. Koplik spots are uniquely and classically associated with measles (rubeola).
Confirm your answer by mentally reviewing the hallmark signs of the other options to ensure they do not fit. Chickenpox has vesicles, Typhoid has rose spots, and Mumps has parotid swelling.

Concept Tested & Keywords

Q8gQpaWijGszRDk_xByvQb

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 MP CHO -2019 (Shift-1)

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