Zoonoses account for over 70% of emerging infectious diseases in humans. In recent years, global public health security has been threatened by zoonotic disease emergence as exemplified by outbreaks of H5N1 and H1N1 influenza, SARS, and most recently Ebola. The occurrence of a number of these zoonoses, and their spread to new areas, is related to globalization, environmental changes, and marginalization of populations.