Millions of children miss measles shots, creating outbreaks - UNICEF

Measles is highly infectious. Without vaccination or prior immunity, the chances of catching measles from another member of your household can be 90%. In one documented case. over 150 people caught measles at Disneyland from possibly one infected person. Prior to vaccination, nearly everyone contracted measles during childhood. Without vaccination you would be susceptible to infection at any age if you come into contact with a measles sufferer (e.g. by travelling to a country where it is still endemic)
 
Mortality - very variable. In populations not previously exposed to measles, mortality rates of up to  50% have been recorded historically. In parts of the Americas, native populations were severely affected by contact with Europeans. In parts of the world with poor healthcare and malnourishment the death rate can still be as high as 10%. Typical death rates in developed countries are around 0.1%. Actual cause of death is complicated as most deaths are due to complications such as seizures, pneumonia, encephalitis etc., and may be recorded as such. Complications can cause death years later. Prior to Vaccination measles killed around one million people a year globally (some estimates far higher). It still kills about 100,000 a year.