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Thirty of 200 ewes died or were euthanatized during a 21-day period following a 1-day accidental exposure to natural gas condensate, a complex mixture of hydrocarbons obtained during collection of natural gas from wells. Despite access to potable well water, the poisoned ewes willingly consumed toxic doses of condensate that contaminated surface water. Eight animals died without premonitory signs; the remainder became ill over the course of a few days to 3 weeks. The principal cause of mortality was aspiration pneumonia, but myocardial degeneration and necrosis, renal tubular damage, gastritis, enteritis, and meningeal edema and hyperemia were also observed. Gas chromatographic analysis identified chemical traces of the hydrocarbons in the tissues, and "fingerprinting," the process of matching chromatographic tracings, provided forensic proof of the contamination source. Atomic absorption spectroscopy and cholinesterase analyses were performed to eliminate the possibility of toxicosis by heavy metal contaminants or other constituents. This appears to be the first reported incidence of natural gas condensate toxicity involving sheep or other ruminants. Although the available literature presents a suggestive pattern of clinical signs and pathologic lesions of petroleum product poisoning, diagnostic investigations should employ detailed analytic examination because each source of petroleum hydrocarbons contains unique sets of components that may produce different toxic effects. 相似文献
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Moulton FR 《Science (New York, N.Y.)》1939,90(2344):499-507
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J E Moulton 《Veterinary pathology》1986,23(1):21-28
Fourteen goats were experimentally infected with Trypanosoma brucei with the following results: Four animals became terminally ill 24 to 47 days after inoculation of trypanosomes and were killed for necropsy. A second group of four goats became sick, had signs of systemic trypanosomiasis, were treated with diminazine aceturate (Berenil) and recovered showing no signs of disease over observation periods of 151 to 163 days. A third group of six goats, were treated with Berenil and temporarily recovered and in 60 to 79 days after therapy; four of these goats underwent relapse infection characterized by severe central nervous system (CNS) disease. Two of these goats were necropsied 45 days after chemotherapy, before clinical signs were evident, to show early neurological lesions. In group 3 (the relapse group), the microscopic changes became more severe as relapse infection progressed. Microscopically, the central nervous system lesions were edema, hyperemia, and infiltration of plasma cells, small lymphocytes, and some macrophages in the leptomeninges, choroid plexus, and brain parenchyma. Relapse infection is discussed from the standpoint of an occult phase of the disease where parasites are protected from the effects of trypanocidal drugs by the blood-brain barrier. 相似文献