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Measles is an extremely contagious viral disease found worldwide.
It most often affects children under 5 years of age.
The case fatality rate during epidemics is between 3 and 15%.
The group of susceptible is composed of unvaccinated individuals and vaccination non-responders.
Areas with inadequate vaccination coverage (≤ 80%) and/or a high birth rate are at high risk for outbreaks.
Without outbreak response vaccination, outbreaks can last anywhere from a few weeks to several months.