This book is the definitive guide to field epidemiology - the application of epidemiologic methods to unexpected health problems (e.g. bioterrorist attacks, natural disasters, industrial accidents) where rapid, on-site investigation is necessary. The third edition includes new chapters on environmental investigations and immunization strategies and evaluation. Existing chapters on bioterrorism, surveillance, and operations have been completely rewritten. The rest of the chapters have been revised and updated with new case studies and examples.