Disease reference · Medical information
Measles — what it is
Measles is a highly contagious but vaccine-preventable viral disease that mainly affects children. Vaccination (MMR) is the safest protection.
Last reviewed 2026-10-07 · Based on WHO / CDC
Overview
Measles is caused by the measles virus and is one of the most contagious vaccine-preventable diseases. It spreads easily among people who are not immune.
Most people recover, but measles can lead to serious complications — especially in young children, pregnant people, and those with weakened immune systems.
Symptoms
Early signs include high fever, runny nose, cough and red, watery eyes (conjunctivitis).
A few days later a flat red rash typically appears, starting on the face and spreading down the body. Tiny white spots inside the mouth (Koplik spots) can also occur.
How it spreads
Through respiratory droplets and airborne particles when an infected person breathes, coughs or sneezes. The virus can linger in the air in a room for a short time.
Because it is so contagious, high vaccination coverage protects people who cannot be vaccinated.
Prevention & care
The MMR (measles–mumps–rubella) vaccine is safe and highly effective, and is the best protection. Two doses are recommended for lasting immunity.
There is no specific antiviral for measles; treatment is supportive and focuses on nutrition, fluids, and managing complications. See a health professional for diagnosis and care.
Questions
How effective is the measles vaccine?
Is measles the same as the Irkutsk case?
Sources
Official / WHO / health authorities (Tier 1)
Tier 3 sources are treated as unverified leads and are never used as the basis for figures.