Crimean Tatars catapult plague-infected corpses into Italian trade settlement. Spanish conquistadors use biological warfare used against Native peoples. Blankets infected with smallpox deliberately given to Native Americans, causing widespread epidemics. Japanese military discovered to have conducted biological warfare experiments on POWs, killing 3000. U.S. shields officers in charge from war crimes trials, in return for data.
Soviets take over German nerve gas facility in Potsdam.
The Nazis had stockpiles of nerve gas, against which the Allies had no defenses, and had also been working on blood agents. Army begins secret tests of biological agents in U. S. cities. San Francisco disease outbreak matching Army bacteria used on city. German chemical weapons researcher Walter Schreiber, working in Texas, exposed as a perpetrator of concentration canp experiments, and flees to Argentina. Army manual explicitly states that bio-chemical warfare is not banned.