This new Handbook presents an overview of cutting-edge research in the growing field of global health security. Over the past decade, the study of global health and its interconnection with security has become a prominent and rapidly growing field of research. Ongoing debates question whether health and security should be linked; which (if any) health issues should be treated as security threats; what should be done to address health security threats; and the positive and negative consequences of 'securitizing' health. In academic and policy terms, the health security field is a time.