A majority of the data was compiled from various publications provided by the U.S. Department of Homeland Security and FEMA, the CDC, Public Safety Canada, the Public Health Agency of Canada, the Red Cross and others.
Some new additions / changes in 5th Edition include Power Loss Mitigation (tips on generators), Civil Disturbances or Civil Unrest, moved nuke appendix up into Terrorism topic, new First Aid topics (swine flu, C. diff and Hands-only CPR) and much, much more.
If more people would take personal responsibility and learn how to prepare themselves and their loved ones, it could alleviate some problems, fear and stress in the U.S. and Canada.