Measles is a very contagious (easily spread) illness caused by a virus.
Measles is spread by contact with droplets from the nose, mouth, or throat of an infected person. Sneezing and coughing can put contaminated droplets into the air.
If one person has the measles, 90% of the people who come in contact with that person will get the measles, unless they are protected.
People who had measles or who have been vaccinated against measles are protected from the disease. Vaccination works so well that in 2000, measles had been eliminated in the United States. However, unvaccinated people who travel to other countries where measles is common have brought the disease back to the United States. This has led to recent outbreaks of measles in groups of people who are unvaccinated.
Some parents do not let their children get vaccinated. This is because of unfounded fears that the MMR vaccine, which protects against measles, mumps, and rubella, can cause autism. Parents and caregivers should know that:
Large studies of thousands of children have found no connection between this or any vaccine and autism.
Reviews by all major health organizations in the United States, Great Britain, and elsewhere all found NO LINK between the MMR vaccine and autism.
The study that had first reported a risk of autism from this vaccine has been proven to be fraudulent.
The most recent measles outbreak started in Disneyland Resort in California. Between January 1 and April 3, 2015, 162 people from 19 states and the Distict of Columbia have been reported to have measles:
District of Columbia
Symptoms usually begin 8 to 12 days after you are exposed to the virus. This is called the incubation period.
Rash is often the main symptom. The rash:
Usually appears 3 to 5 days after the first signs of being sick
May last 4 to 7 days
Usually starts on the head and spreads to other areas, moving down the body
May appear as flat, discolored areas (macules) and solid, red, raised areas (papules) that later join together
Call your health care provider if you or your child has symptoms of measles.
Getting vaccinated is a very effective way to prevent measles. People who are not immunized, or who have not received the full immunization are at high risk of catching the disease.
Taking serum immune globulin within 6 days after being exposed to the virus can reduce the risk of developing measles or make the disease less severe.
Gershon AA. Measles virus (rubeola). In: Bennett JE, Dolin R, Mandell GL, eds. Principles and Practice of Infectious Diseases. 8th ed. Philadelphia, PA: Elsevier Saunders; 2014:chap 162.
Mason WH. Measles. In: Kliegman RM, Stanton BF, St. Geme JW III, et al., eds. Nelson Textbook of Pediatrics. 19th ed. Philadelphia, PA: Elsevier Saunders; 2011:chap 238.
Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine, Seattle, WA. Editorial update: 04/23/2015. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.