Measles is a highly contagious viral illness with symptoms typically appearing 7 to 14 days after exposure to the virus. Early signs include a high fever (often exceeding 104°F) and the “3 Cs”—cough, coryza (runny nose), and conjunctivitis (red, watery eyes). Around 2 to 3 days after initial symptoms, Koplik spots—small, white lesions—appear inside the mouth and are considered a classic diagnostic sign. Within 3 to 5 days after symptom onset, a characteristic maculopapular rash develops, beginning on the face and head before spreading downward to the trunk and legs. The rash consists of flat, red spots that may merge as it progresses. Understanding the sequential presentation of symptoms helps with early recognition, isolation precautions, and timely supportive care to prevent complications and reduce transmission.
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