The advances in medicine made a dramatic difference for Allied troops , while the Germans and especially the Japanese and Chinese suffered from a severe lack of newer medicines , techniques and facilities . Harrison finds that the chances of recovery for a badly wounded British infantryman were as much as 25 times better than in the First World War . The reason was that : Unethical human subject research , and killing of patients with disabilities , peaked during the Nazi era , with Nazi human experimentation and Aktion T4 during the Holocaust as the most significant examples . Many of the details of these and related events were the focus of the Doctors ' Trial . Subsequently , principles of medical ethics , such as the Nuremberg Code , were introduced to prevent a recurrence of such atrocities . After 1937 , the Japanese Army established programs of biological warfare in China . In Unit 731 , Japanese doctors and research scientists conducted large numbers of vivisections and experiments on human beings , mostly Chinese victims
Unit 731
Unit 731
History of medicine