Chinese Biowar Program
During the Great Oriental War, China used a number of biological attacks against her enemies. The biowar program was lead by a Japanese doctor by the name of Ixii Xirò, who immigrated to China after failing to convince his own government of the need for a biowar program.
The earliest developments of the Biowar program began in the early 20's, in a purely defensive fashion, as Dr. Ixii had convinced the Chinese government that Australasia, Russia, and the Federated Kingdoms, among other potential enemies, were developing biowar weapons of their own. This early work focused on developing vaccines for potential biological weapons, and ensuring proper hygiene for the troops, including the development of the Ixii Filter.
Beginning of Offensive Development
In 1926, China set up a research facility in occupied Corea, with a secondary facility located in "North Manchuria", as they named the territory captured from the Soviet Socialist Republic of Siberia. The official story was that the facility was a lumber mill. Using Communist prisoners, and captured Corean rebels, the doctors began conducting horrifying experiments, including live vivisections, aimed at working out the best methods of using germs in warfare. The doctors euphemistically referred to their victims as "logs", stemming from the cover story. The North Manchurian facility was abandoned, and burned to the ground, as the Russians began recapturing the territory.
By the late 30's, rebellious cities in occupied territories were attacked with weapons developed at the Corean facility.
Initially, the Chinese government was reluctant to use their germs against the Australasians, uncertain whether their enemy had similar weapons. However, by 1943, the Chinese government was becoming increasingly desperate to break the stalemate and authorized limited use. When they learned for a fact that the Australasians had no bioweapons, they began using them on a larger scale.
Australasian troops learned to protect themselves against Chinese bioweapons to an extent, although they continued to suffer considerable losses. Widespread vaccination helped to reduce losses.
After the destruction of Beijing, Ixii disappeared. Rumors said that he had been granted asylum by the Australasians in return for his scientific knowledge. However, those rumors were settled after the fall of the Snorist Republic of Ezo, when declassified documents showed that he'd fled to Ezo to continue his work until his death in 1959.
It is estimated that at least 500,000 deaths can be attributed to the Chinese biowar attacks.