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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.
Ebola virus disease: an overview. Ebola virus disease is a serious illness that originated in Africa, where there is currently an outbreak. But for people living in countries outside Africa, it continues to be a very low threat. The current outbreak of the Ebola virus mainly affects three countries in West Africa: Guinea, Liberia and Sierra Leone.