This document summarizes information about bird flu (H5N1 avian influenza). It discusses the history of bird flu, including the first known cases of transmission from birds to humans in 1997. It provides details on the spread of bird flu to over 10 countries in Asia in 2004. While human-to-human transmission has been documented, it is usually between family members or caregivers. The document also outlines the symptoms of bird flu and treatment options, as well as strategies for disaster planning and prevention.