In 20 percent of all cases of infection, infection can lead to one or more complications.
This is most common in children younger than 5 years and older than 20 years.
Arya virus, among other things, can cause infections like ear, sinus or pneumonia.
The disease can be complicated by acute brain inflammation, 1 in every 1,000 cases that can be fatal.
According to WHO estimates, about 140,000 people died as a result of measles in 2010. Most were children under the age of five.
In Sweden today, deaths due to measles are very unusual.
Source: WHO, Public Health Authority