How do diseases spread from animals to humans? Is it possible to forecast where disease outbreaks will occur and when they will blow up into major health crises? In one of the earliest episodes of Big Biology, Marty and Art talk to Barbara Han, a disease ecologist at the Cary Institute of Ecosystem Studies, about her research on zoonotic disease, how we track the spread of infectious diseases and whether we'll ever be able to predict outbreaks.

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