Volume 5, Number 4—August 1999
THEME ISSUE
Bioterrorism
Historical Review
Historical Trends Related to Bioterrorism: An Empirical Analysis
Figure 3

Figure 3. (A) Actual chemical and biological incidents vs. hoaxes, 1960–1998 (278 cases). (B) Chemical and biological hoaxes over time, 1960–1998 (93 cases: 43 chemical, 50 biological).