This volume focuses on Global Catastrophic Biological Risks (GCBRs), a special class of infectious disease outbreaks or pandemics in which the combined capacity of the world's private and government resources becomes severely strained. These events, of which the 1918 influenza pandemic is emblematic, cause severe disruptions in the normal functioning of the world, exact heavy tolls in terms of morbidity and mortality, and lead to major economic losses. GCBRs can be caused by any type of microorganism, and myriad contextual factors can influence their impact. Additionally, there are cascading questions that arise in connection with GCBR prediction, preparation, and response. This book gathers contributions from thought leaders who discuss the multi-faceted approaches needed in order to address this problem. From understanding the special characteristics of various microbes to financing challenges, the volume provides an essential primer on a neglected but highly relevant topic. Physicians, scientists, policymakers, public health practitioners and anyone with an interest in the field of pandemics, emerging infectious disease, biosecurity, and global health security will find it a valuable and insightful resource.