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They are a result of things people do to nature. Disease, it turns out, is largely an environmental issue. Sixty percent of emerging infectious diseases that affect humans are zoonotic â they originate in animals. And more than two-thirds of those originate in wildlife.
Two major categories of emerging infectionsâ newly emerging and reemerging infectious diseasesâcan be defined, respectively, as diseases that are recognized in the human host for the first time; and diseases that historically have infected humans, but continue to appear in new locations or in drug-resistant forms, or that reappear after apparent control or elimination .