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 educating staff and the community. The document notes strategic considerations around emergency triage and response according to medical need, as well as psychological considerations. It describes the Strategic National Stockpile and Chempack programs, and provides information on volunteering through programs like ESAR-VHP.