|
| Section2 = | Section3 = }} T-2 is a trichothecene mycotoxin. It is a naturally occurring mold byproduct of ''Fusarium'' spp. fungus which is toxic to humans and animals. The clinical condition it causes is ''alimentary toxic aleukia'' and a host of symptoms related to organs as diverse as the skin, airway, and stomach ingestion may come from consumption of moldy whole grains. T-2 can be absorbed through human skin. Although no significant systemic effects are expected after dermal contact in normal agricultural or residential environments, local skin effects can not be excluded. Hence, skin contact with T-2 should be limited. ==History== Alimentary toxic aleukia (ATA), a disease which is caused by trichothecenes like T-2 mycotoxin, killed many thousands of USSR-citizens in the Orenburg District in the 1940s. It was reported that the mortality rate was 10% of the entire population in that area. During the 1970s it was proposed that the consumption of contaminated food was the cause of this mass poisoning. Because of World War II, harvesting of grains was delayed and food was scarce in Russia. This resulted in the consumption of grain that was contaminated with Fusarium molds, which produce T-2 mycotoxin.〔Pitt, J. L., An introduction to mycotoxins. In Mycotoxin prevention and control in foodgrains, 1989.〕 Although it is still controversial, it is suspected that T-2 mycotoxin has been used as a chemical warfare agent from the 1970s till the 1990s. Based on the descriptions of eyewitnesses and victims, T-2 mycotoxin was mostly delivered by low-flying aircraft that released a yellow oily liquid. Hence, this phenomenon is also named “yellow rain”. In 1982, the US Secretary of State Alexander Haig and his successor George P. Shultz accused the Soviet Union of using T-2 mycotoxin as a chemical weapon in Laos (1975–81), Kampuchea (1979–81), and Afghanistan (1979–81), where it allegedly has caused thousands of casualties.〔Shultz, G. P. Chemical warfare in Southeast Asia and Afghanistan: an update; The United States Secretary Of State: Washington, D.C., 1982.〕 Although several US chemical weapons experts have identified “yellow rain” samples from Laos as trichothecenes, other experts believe that this exposure was due to naturally occurring T-2 mycotoxin in contaminated foods. A second alternative theory was developed by Harvard biologist Matthew Meselson, who proposed that the “yellow rain” found in Southeast Asia originates from the excrement of jungle bees.〔Yellow Rain Falls. The New York Times 3 September 1987.〕 The first indication for this theory came from finding high levels of pollen in the collected samples, giving the substance its yellow color. It was also found that jungle bees in this area fly collectively in great numbers, at altitudes too high to be easily seen, producing showers of feces that could have been mistaken for sprays from aircraft. T-2 mycotoxin is also thought to be a cause of Gulf War Syndrome. US troops suffered from mycotoxosis-like symptoms after an Iraqi missile detonated in a US military camp in Saudi Arabia during Operation Desert Storm in the Persian Gulf War, in 1991. It has been shown that Iraq researched trichothecene mycotoxins, among other substances, and thus was capable of its possession and its usage in chemical warfare. Nevertheless, much of the key information from these incidents remains classified, leaving these matters still unresolved. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「T-2 mycotoxin」の詳細全文を読む スポンサード リンク
|