Biological warfare Bioterrorism 50 Prevention 43 Chemical warfare 42 Biological weapons 34 Safety measures 27 History 16 more ... Terrorism 15 Research 14 National security 11 Emergency management 10 Health aspects 10 Civil defense 9 Medical care 9 Biological arms control 8 Moral and ethical aspects 8 Chemical agents (Munitions) 7 Communicable diseases 7 Evaluation 7 Korean War, 1950-1953 7 Public health 7 Security, International 7 Agroterrorism 6 Biotechnology 6 Health risk assessment 6 Vaccines 6 Armed Forces 5 Nuclear warfare 5 Security measures 5 Social problems 5 less ...