In 1952, during the Korean War, the U.S. dropped anthrax-infected spiders and flies on a Chinese village.
(This comes from the ISC Report on U.S.'s Use of Biological Weapons in Korea and China recently uploaded by @jeff_kaye): medium.com/insurge-intell…
(This comes from the ISC Report on U.S.'s Use of Biological Weapons in Korea and China recently uploaded by @jeff_kaye): medium.com/insurge-intell…
That's from pp. 32-33.
In another incident, the U.S. dropped beetles, flies, and feathers infected with anthrax on Chinese villages, which killed at least 5 people through inhalation. documentcloud.org/documents/4334… 
Here's another incident where the U.S. dropped rodents infested with the PLAGUE on a Manchurian village. They were likely dropped via self-immolating parachutes. documentcloud.org/documents/4334… 
