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Human activities are advancing the spread of vector-borne, zoonotic diseases such as West Nile virus, Lyme disease and dengue fever report scientists. Vector-borne zoonotic diseases result from disease-causing agents or pathogens that naturally infect wildlife. In short, they're diseases transmitted between animals and humans. Widespread land-use change, globalization of trade and travel, and social upheaval are driving the emergence of zoonotic diseases around the world. [Source: National Science Foundation]
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