Which virus causes measles?

The virus enters through the nose or mouth and multiplies in the respiratory tract before illness becomes noticeable. Fever, cough, runny nose, sore or red eyes, and a rash may follow. The rash often begins on the face or hairline and moves down the body. A [Fever](/symptoms/fever/) or rash alone cannot establish that measles is the cause.

Measles is different from bacterial infections, so antibiotics do not treat the virus itself. A suspected case needs careful assessment because the infection can spread readily to people who are not immune. More background is available on [Measles](/conditions/measles/).

Call a GP or public-health service before attending in person if measles is possible. Mention the exposure, symptoms, travel, and vaccination history. Avoid close contact and shared indoor spaces until you receive advice. Supportive care may include rest and fluids. Discuss [MMR Vaccination](/treatments/preventive-care-and-vaccination/mmr-vaccination/) with a clinician, especially when vaccination records are incomplete.

Get urgent help for breathing difficulty, bluish lips, severe weakness, confusion, a seizure, inability to drink, or signs of dehydration. Seek prompt clinical advice after an exposure if the person is pregnant, an infant, or has a weakened immune system. [Swollen Glands](/symptoms/swollen-glands/) can accompany infections but do not prove measles.

Ask when isolation can end, whether testing or contact tracing is needed, which symptoms require urgent review, and whether family members need vaccination or exposure advice.