Mostly calculated based on the expected attack rate. As measles is one of the most contagious diseases with regard to humans, with about 90% attack rate, it requires a higher rate of vaccination than some others. 95% is about as good as you can get in a large population. I am a country doc, I fully expect there is an epidemiologist on here who could go into the details of that calculation, but that is the high altitude overview.
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