Federal biodefense readiness : hearing before the Committee on Health, Education, Labor, and Pensions, United States Senate, One Hundred Eighth Congress, first session, on examining Federal biodefense readiness, focusing on the public health workforce, the status of Centers for Disease Control terrorism preparedness and emergency response activities, the emergency communication system, smallpox preparedness, the Food and Drug Administration's role in counterterrorism activities, vulnerability and threat assessments, laboratory enhancements, research, Operation Liberty Shield, and developing the research infrastructure, July 24, 2003.