That the Japanese attempted to kill millions of people with biological weapons is undisputed; it is less certain, however, how successful were their efforts. Vast numbers of Chinese died in epidemics between 1936 and 1945, and modern China attributes most of these losses to Japanese action. In a broad sense this is just, since privation and starvation were consequences of Japanese aggression. But it remains unproven that Unit 731’s operations were directly responsible. For instance, over 200,000 people died during the 1942 cholera epidemic in Yunnan. The Japanese released cholera bacteria in
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