Edited sentence: Many things about the exact circumstances of the accident are unknown and perhaps irrelevant.Most recently Viktor Yushchenko, the president of Ukraine, was poisoned with TCDD and subsequently suffered from chloracne.No human is known to have died from dioxin poisoning but its toxic effects have been documented in cases such as the Yusho disaster in Japan in 1968, the Yucheng disaster in Taiwan in 1979 as well as in Vietnam War veterans who processed and sprayed Agent Orange, which contained dioxin and diesel fuel.The Seveso disaster, although a serious industrial accident, did not lead to any direct human fatalities.The accident exposed serious flaws in government response to industrial accidents