Communicating in a Crisis: Risk Communication Guidelines for Public Officials 
Sound and thoughtful risk communication can assist public officials in preventing ineffective, fear-driven, and potentially damaging public responses to serious crises such as unusual disease outbreaks and bioterrorism. Moreover, appropriate risk communication procedures foster the trust and confidence that are vital in a crisis situation.
U.S. Department of Health and Human Services (2002). Books>Risk Communication>Biomedical>Crisis Communication