The Epidemiology and Toxicology of Agent Orange,
SCHOOL OF AEROSPACE MEDICINE BROOKS AFB TX
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An estimated 107 million pounds of herbicides were aerially-disseminated on three million acres in South Vietnam from January 1962 through October 1971. Approximately 94 percent of all herbicides sprayed in Vietnam were 2,4-D 56 million pounds or 53 percent of total or 2,4,5-T 44 million pounds or 41 percent of total. The 44 million pounds of 2,4,5-T contained an estimated 368 pounds of the toxic contaminant, 2,3,7,8-tetrachlorodibenzo-p-dioxin TCDD or dioxin. Currently, there are no epidemiologic data associating TCDD with any long-term health effects in humans other than intermittent Chloracne however, while there is no evidence validating serious long-term health effects, neither is there strong evidence for lack of effect.