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In page Pandemic:
"Measles is an endemic disease, meaning that it has been continually present in a community, and many people develop resistance. In populations that have not been exposed to measles, exposure to a new disease can be devastating. In 1529, a measles outbreak in Cuba killed two-thirds of the natives who had previously survived smallpox.[4] The disease had ravaged Mexico, Central America, and the Inca civilization.[5]
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