Zhejiang, China was of strategic importance in WWII, as several airfields in the area were used as Allied bases. The Zhejiang-Jiangxi Railway also was viewed as an important supply line. The Imperial Japanese Army then launched strategic attacks on the railway from May to September of 1942. Biological weapons were used during this attack.
Besides plague, anthrax and glanders were also used. Cutaneous anthrax, infectious where the bacteria makes a breach through an opening in the skin, constitutes the most prevalent form of anthrax infection. The specific cause of the victims' suffering was a bacteria called Bacillus Anthracis, or anthrax. Victims lived with rotten legs for decades after the war.
To learn more, get a copy of Seeking Justice for Biological Warfare Victims of Unit 731: Evidence Collected by Wang Xuan