Diagnosis and treatment of bacterial pyodermas.
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Two hundred and thirty-one cases of orf were reported in one year from 18 meat works slaughtering lambs and sheep. This represented 1.4 percent of the total employees at these works and 4 percent of those working on the mutton slaughter board. One hundred and nineteen of these reports were accompanied by samples of the lesion and 85 percent of lesions contained orf virus particles as determined by electron microscopy. The tasks that led to the greatest risk of contracting orf were related to handling pelts and/or wool. Ninety-five percent of lesions were on the hands. The risk of a worker contracting orf did not decrease with the number of years employed at the meat works and 18 cases of re-infection were reported. Control of the disease in man in the meat industry will be difficult in the short term. In the long term control of the disease in man will rely on control of the disease in sheep. Alternative vaccines for sheep will need to be found.
A 24-year-old man developed a papular eruption on his hands after butchering sheep. Viral cultures and serum antibody levels confirmed the diagnosis of orf. The clinical features, histologic findings, and diagnostic criteria of orf are described.
A 35-year-old woman developed an orf infection of the fingers after contact with an infected goat. Following the primary orf infection, erythema multiforme developed and was controlled with prednisone. The association between erythema multiforme and orf is discussed; also, it is noted that orf is another viral condition that should be added to the agents that can initiate erythema multiforme.
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Veterinarians, in clinical practice, regulatory field work, laboratory diagnosis or research, must work together as a team, each within his area of expertise in order to protect the livestock industry of Canada from exotic diseases. This freedom from many of the serious animal plagues has allowed the development of intensive animal production units with increased vulnerability to disease and in which the impact of disease outbreaks may be more serious. In differential diagnoses one should think not only of the classical exotic diseases such as vesicular diseases, swine fever and rinderpest in today's world, but one should constantly be on the outlook for any disease outbreak that does not quite fit the picture of the domestic diseases. From this standpoint the large animal practitioner is the very important "first line of defense" since, in all likelihood, he will be the first to see a disease exotic to Canada should that disease gain entry.
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