Measles is a very contagious (easily spread) illness caused by a virus.
Causes, incidence, and risk factors
The infection 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.
Those who have had an active measles infection or who have been vaccinated against the measles have immunity to the disease. Before widespread vaccination, measles was so common during childhood that most people became sick with the disease by age 20. The number of measles cases dropped over the last several decades to almost none in the U.S. and Canada. However, rates have started to rise again recently.
Some parents do not let their children get vaccinated because of unfounded fears that the MMR vaccine, which protects against measles, mumps, and rubella, can cause autism. Large studies of thousands of children have found no connection between this vaccine and autism. Not vaccinating children can lead to outbreaks of a measles, mumps, and rubella -- all of which are potentially serious diseases of childhood.
Symptoms usually begin 8 - 12 days after you are exposed to the virus. This is called the incubation period.
Tiny white spots inside the mouth (Koplik's spots)
Signs and tests
Viral culture (rarely done)
There is no specific treatment for the measles.
The following may relieve symptoms:
Some children may need vitamin A supplements. Vitamin A reduces the risk of death and complications in children in less developed countries, where children may not be getting enough vitamin A. People who don't get enough vitamin A are more likely to get infections, including measles. It is not clear whether children in more developed countries would benefit from supplements.
Those who do not have complications such as pneumonia do very well.
Call your health care provider if you or your child has symptoms of measles.
Routine immunization is highly effective for preventing measles. People who are not immunized, or who have not received the full immunization are at high risk for catching the disease.
Taking serum immune globulin 6 days after being exposed to the virus can reduce the risk of developing measles, or can make the disease less severe.
Mason WH. Measles. In: Kliegman RM, Behrman RE, Jenson HB, Stanton BF, eds. Nelson Textbook of Pediatrics. 19th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 238.
Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M. Health Solutions, Ebix, Inc.