The 3 Cs of Measles Explained

Coryza means a runny or blocked nose, while conjunctivitis causes red, watery, light-sensitive, or irritated eyes. These symptoms support clinical suspicion when they occur in someone with a compatible illness or measles exposure, but they are not enough to diagnose measles on their own.

Measles commonly presents with fever and the 3 Cs before a blotchy rash spreads from the face and hairline down the body. Small pale spots can appear inside the mouth. The timing and combination of findings matter because cough, nasal symptoms, and red eyes also occur with other infections and allergies.

Measles spreads readily through the air and can expose other people before the diagnosis is confirmed. A clinician may arrange testing and give instructions that limit contact with people at greater risk, including babies, pregnant people, and those with weakened immune systems.

Call a GP or healthcare facility before attending in person and explain the symptoms, rash, vaccination history, and any known exposure. Calling ahead allows staff to arrange assessment without exposing people in a shared waiting area. Follow local public-health or clinical instructions about staying away from school, work, childcare, and visitors.

Rest, take regular fluids, and use fever medicine only as directed for the person's age and health. Keep the room comfortably dim if light hurts the eyes. Do not give aspirin to a child, and do not rely on antibiotics for the measles virus; a clinician may prescribe antibiotics only if a separate bacterial infection develops.

Seek urgent medical help for difficulty breathing, blue or grey lips, severe drowsiness, confusion, a seizure, a stiff neck, severe headache, or a rash that does not fade when pressed. Repeated vomiting, inability to drink, very little urine, a dry mouth, or worsening weakness can indicate dehydration and also need prompt assessment.

Contact a clinician promptly if symptoms are worsening, fever is not settling, ear pain develops, or a child is difficult to wake or unusually floppy. Tell the service that measles is suspected before arrival. After exposure, pregnant people, infants, unvaccinated people, and anyone with a weakened immune system should obtain individual advice promptly, even before symptoms appear.

Ask whether testing is needed, how to avoid exposing others, which symptoms should trigger emergency care, and when normal activities can resume. Confirm vaccination records and ask whether close contacts need time-sensitive preventive advice, especially if anyone exposed is pregnant, very young, or immunocompromised.