Here's a webpage on the Japanese Biological Unit I spoke of - Unit 731.
(There were also other Units involved in both Biological and Chemical (gases) research and manufacture).
http://www.skycitygallery.com/japan/japan.html#unit731"The Other Holocaust"
The research program was one of the great secrets of Japan during and after World War II : a vast project to develop weapons of biological warfare including following deadly diseases :
Bubonic Plague, Anthrax (including inhalation,
skin and gastrointestinal types),
Smallpox, Typhoid,
Paratyphoid A and B, Tularemia,
Cholera Epidemic, Hemorrhagic Fever,
Syphilis, Aerosols,
Botulism, Brucellosis,
Dysentery, Tetanus,
Glanders, Tuberculosis,
Yellow feve,r Typhus,
Tularemia, Gas Gangrene,
Scarlet Fever, Songo,
Diphtheria, Brysipelas,
Selmonella, Venereal Diseases
Infectious Jaundice Undulant Fever
Epidemic Cerebrospinal Meningitis, Tick Encephalitis,
Plant diseases for crop destruction, Dozen other pathogens
Unit 731 & Unit 100 were comprised of over 3,000 researchers and technicians. It was a gigantic research center focused on biological weapons - the world's most technically advanced at the time, used human as the guinea pigs, known as marutas (logs). The Japanese told the locals that the facilities were lumber mills.
The Ping Fan facility alone could monthly "manufacture as much as 300 kg of plague bacteria... 500-600 kg of anthrax germs, 800-900 kg typhoid, paratyphoid, or dysentery germs, or as much as 1000 kg of cholera germs." If several different diseases were manufactured simultaneously, then the total production of pathogens could be many times higher.
A former member of Unit 731 testified that "to eliminate any chance of leaking out the secret of construction of the 'Square Buildings' by the laborers, they are all sent to special prison and used as the first batch of test objects."
More than 10,000 Chinese, Korean and Russian PoWs were slaughtered in these biological experiments