In the Middle Ages , as an early example of biological warfare , diseased corpses were thrown into castles during sieges using catapults or other siege engines . Individuals near the corpses were exposed to the pathogen and were likely to spread that pathogen to others . In modern times , bioterrorism has included the 1984 Rajneeshee bioterror attack and the 1993 release of anthrax by Aum Shinrikyo in Tokyo
1984 Rajneeshee bioterror attack
1984 Rajneeshee bioterror attack
Microorganism