Epidemiology and Pathology of a Tetrachlorodibenzodioxin Poisoning Episode

Abstract
An epidemiological and laboratory investigation of a poisoning outbreak that involved 3 riding arenas and killed 57 horses, 5 colts and numerous other animals [cats, dogs, birds, mice] is described. The outbreak was traced to the spraying of the arenas with salvage oil contaminated with tetrachlorodibenzodioxin, trichlorophenol and polychlorinated biphenyls. The contamination of the salvage oil resulted from the improper disposal of toxic industrial waste. In the tissues of the horses available for study, the most prominent lesion was a centrilobular fibrosis of the liver that arose in the wall of the central veins. This lesion resembled the chronic form of veno-occlusive disease of the liver in humans.

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