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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.
Emerging Pandemic Threats. About 75 percent of new human diseases are caused by microbes that originate in animals. These include HIV and AIDS, influenzas (including pandemic H1N1, H5N1 and H7N9), Severe Acute Respiratory Syndrome (SARS), Middle East Respiratory Syndrome-Coronavirus (MERS-CoV), Ebola, Marburg, and Nipah.