The document discusses emergency preparedness for public health threats from chemical, biological, radiological, nuclear, and explosive events. It outlines recognition of signs and symptoms of different threats. It also discusses three levels of prevention for public health, planning for natural disaster response, and considerations for disaster nursing. The document notes strategies for emergency triage and response using sorting criteria. It describes the Strategic National Stockpile and Chempack programs and provides information on volunteering through programs like ESAR-VHP.