A nurse is planning an in-service about communicable diseases for staff members. Which of the following diseases should the nurse identify as causing Koplik spots?

Rationale: A. Diphtheria causes a thick gray membrane in the throat but not Koplik spots. B. Poliomyelitis primarily affects the nervous system and does not present with Koplik spots. C. Fifth disease causes a "slapped cheek" facial rash but no Koplik spots. D. Measles (rubeola) is characterized by the presence of Koplik spots—small, bluish-white spots with a red base found on the buccal mucosa—which are an early and distinctive sign of the disease.