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November 22, 2009
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Measles (Rubeola) (cont.)

What is modified measles?

Modified measles is seen in patients who, because they were unimmunized, received immune globulin after being exposed to a patient with measles. It is also seen occasionally in young infants who have limited immunity from their mothers. The immune globulin prolongs the time from exposure to onset of symptoms (incubation period). When the symptoms do occur, they are much milder than those seen with normal measles and tend to last a shorter period of time.

How is the diagnosis of measles made?

The diagnosis of suspected measles is mostly clinical, meaning that the appearance and history of the patient suggest the diagnosis. In a person with known exposure to someone with measles or travel to a foreign country, measles should always be considered when faced with a patient who has high fever and characteristic rash. Until the rash appears, the presence of Koplik's spots should help to suggest the diagnosis. Most cases of suspected measles in the United States turn out not to be measles (see below). It is recommended that the diagnosis be confirmed using a blood test for IgM, a type of antibody against the virus. If the IgM test is positive, viral cultures should be obtained. The state and local health department should be contacted immediately for any suspected case in order to follow the correct procedures for viral culture and isolation of the patient. Further information on laboratory testing of suspected cases is available from the CDC (http://www.cdc.gov/vaccines/pubs/surv-manual/downloads/chpt06_measles.pdf).

If it is not measles, what else could it be?

There are a large number of infectious diseases that can cause some of the symptoms of measles. These include, but are not limited to, dengue, drug rashes, enteroviral infections, fifth disease, German measles (rubella), Kawasaki disease, Rocky Mountain spotted fever, roseola, and toxic shock syndrome. It is important that suspected cases be seen by a medical expert and appropriate laboratory tests be ordered.



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Measles - Complications

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