An analysis of state public health emergency declarations.

Disaster responses often involve coordination among multiple levels of government and public and private sector collaboration. When emergencies raise health concerns, governments must include public health and health care systems in their response. A state government's declaration of "public health emergency" can provide that state's health sector with flexibility and guidance about response parameters. Although events including Hurricanes Katrina and Sandy and the H1N1 influenza outbreak provided opportunities for states to deploy their public health emergency powers, little has been reported about how states have used their authority to declare a public health emergency. I present a systematic identification and analysis of states' public health emergency declarations, examine why these declarations were issued, and discuss their potential value.