Roundtable discussion : preparing a national biodefense--S. 975 : hearing before the Subcommittee on Bioterrorism and Public Health Preparedness of the Committee on Health, Education, Labor, and Pensions, United States Senate, One Hundred Ninth Congress, first session, on examining S. 975, to provide incentives to increase research by private sector entities to develop medical countermeasures to prevent, detect, identify, contain, and treat illnesses, including those associated with biological, chemical, nuclear, or radiological weapons attack or an infectious disease outbreak, July 21, 2005.