(CIT): Dr. Waldhorn's lecture will focus on the differential diagnosis of patients who present with respiratory signs and symptoms, as might occur following exposure to an aerosol release of a bioterror agent. Dr. Waldhorn directed the Medical Intensive Care Unit and the Division of Pulmonary and Critical Care Medicine at Georgetown University Hospital, and from 2001-4 was Chairman of the Department of Medicine and Physician in Chief. In October, 2004, Dr. Waldhorn joined the Center for Biosecurity of UPMC, where he studies strategically important information requirements for the response to bioterrorism and epidemic disease and analyzes hospital emergency preparedness and response for mass casualty events. He is an associate editor of the Clinicians Biodefense Network and of the journal Biosecurity and Bioterrorism.