Unit 100

Unit 100 (第百部隊, dai-hyaku butai) was an Imperial Japanese Army facility called the Kwantung Army Warhorse Disease Prevention Shop that focused on the development of biological weapons during World War II. It was operated by the Kempeitai, the Japanese military police. Its headquarters was located in Mokotan, Manchukuo, a village just south of the city of Changchun.:312 It had branches in Dairen and Hailar. The Hailar branch was later transferred to Foshan.:313 Between 600 and 800 people worked at Unit 100.:313

The Unit focused on plant and animal biological warfare, producing and deploying livestock and crop viruses in China. The Unit was led by Wakamatsu Yujiro. Unit 100 would cooperate with Unit 731 when necessary.