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Field Outbreaks of Colibacillosis of Turkeys Associated with Hemorrhagic Enteritis Virus

D. P. Sponenberg, C. H. Domermuth and C. T. Larsen
Avian Diseases
Vol. 29, No. 3 (Jul. - Sep., 1985), pp. 838-842
DOI: 10.2307/1590676
Stable URL: http://www.jstor.org/stable/1590676
Page Count: 5
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Field Outbreaks of Colibacillosis of Turkeys Associated with Hemorrhagic Enteritis Virus
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Abstract

In a study of field material and a survey conducted by the authors, typical signs of colibacillosis of 6-to-12-week-old poults included sudden onset, listlessness, rales, and high mortality. Signs persisted for about 2 weeks and were often followed by a low incidence of lameness caused by Escherichia coli. Gross lesions included enlarged and congested spleens and livers, and dilated discolored black or purple duodenal loops. Microscopic lesions included splenic and hepatic congestion. In some birds (freshly killed and fixed immediately), the epithelium at the tips of the duodenal villi was sloughing, but in other birds the villi were intact and normal in appearance. Splenic enlargement, the presence of intranuclear splenic inclusions similar to those found in hemorrhagic enteritis (HE), and the isolation of HE virus from some of the field spleens all indicated that inapparent HE infection often occurs at approximately the same time as this type of colibacillosis. It is therefore believed that HE infection often exacerbates colibacillosis of older poults. /// Se observaron signos típicos de Colibacilosis en pavos de 6 a 12 semanas de edad con una presentación súbita, estertores y mortalidad elevada. Estos signos duraron aproximadamente 2 semanas y frecuentemente dejaron como secuela una incidencia baja de problemas de claudicación causados por Escherichia coli. Las lesiones macroscópicas fueron hepatomegalia, esplecnomegalia, dilatación del asa duodenal casi al doble del diá metro normal con una coloración negra o morada y un contenido mucoide. Microscópicamente se observó congestión en el hígado y bazo mientras que en el duodeno no se observaron cambios notables. En algunas aves que se sacrificaron y los tejidos se fijaron inmediatamente, se observó la pérdida de los extremos de las vellosidades intestinales a nivel del duodeno aunque en otras aves su apariencia era normal. En todos los casos, se encontró una gran cantidad de bacterias en el lumen. La esplecnomegalia, la presencia de cuerpos de inclusión intranucleares en el bazo similares a los reportados en la enteritis hemorrágica y el aislamiento del virus de la enteritis hemorrágica a partir del bazo, indican que este tipo de brotes de colibacilosis ocurren al mismo tiempo que infecciones inaparentes de la enteritis hemorrágica. Se cree que la infección con enteritis hemorrágica en estos pavos desencadena la presentacíon de los brotes de colibacilosis.

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