Abstract
In the spring of 1997, three large white hybrid turkey layer flocks of 52 wk of age experienced a severe respiratory condition. During the outbreak, the turkeys showed respiratory signs, an increased mortality rate, and an important drop in egg production. Macroscopic and histopathologic examinations were carried out on several carcasses, as well as bacteriologic analyses on different tissues. Colonies of Ornithobacterium rhinotracheale (OR) were detected after 24 hr of incubation, and the isolate appeared to be serotype A. The identification of the species was confirmed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis of whole-cell proteins. Since 1993, several cases of OR infection have been diagnosed in the United States and more recently in Canada. Monitoring of this emerging infection is recommended.
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