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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.
References: 1  CDC | Emerging Tickborne Diseases | Public Health Grand Rounds, March 2017. 2  U.S. publicâs experience with ticks and tick-borne diseases: Results from national HealthStyles surveys. 3  Relative Risk for Ehrlichiosis and Lyme Disease in an Area Where Vectors for Both Are Sympatric, New Jersey, USA.