Which statement best describes Koplik spots in relation to measles?

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They are the initial sign of measles infectionThey occur infrequently in measles casesThey appear 2 to 3 days following the skin rashThey represent the earliest symptom but are rarely observedThey are a late-stage symptom of measles

Explanation

Koplik spots are considered the earliest clinical sign of measles; however, they are not commonly seen in all patients, making them an uncommon initial manifestation.