Chronology of Major Events in the History of Biological and Chemical Weapons

Updated August 2008

For the purposes of this chronology, chemical weapons are defined in the same manner as Article II of the Chemical Weapons Convention (CWC): “Munitions and devices specifically designed to cause death through [their] toxic properties…” The definition of biological weapons follows Article I of the Biological and Toxic Weapons Convention (BTWC) as paraphrased: microbial and biological agents employed for hostile purposes.

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