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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.
In this Article. An important focus of the National Institute of Allergy and Infectious Diseases (NIAID) is research devoted to the pathogenesis of human immunodeficiency virus (HIV) disease Â¾ the complex mechanisms that result in the destruction of the immune system of an HIV-infected person.