For measles, 90 to 95 percent of people must be vaccinated in order to protect the entire population

Measles is a highly transmissible disease; so transmissible in fact, that 90 to 95 percent of people must be vaccinated in order to protect the entire population, or achieve what is called “herd immunity.” This effect is what helps eliminate disease entirely.

via What the Anti-Vaxxers are Getting Dangerously Wrong 

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