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Differences in the Pathogenicity of Various Bacterial Isolates Used in an Induction Model for Gangrenous Dermatitis in Broiler Chickens

T. D. Wilder, J. M. Barbaree, K. S. Macklin and R. A. Norton
Avian Diseases
Vol. 45, No. 3 (Jul. - Sep., 2001), pp. 659-662
DOI: 10.2307/1592908
Stable URL: http://www.jstor.org/stable/1592908
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Differences in the Pathogenicity of Various Bacterial Isolates Used in an Induction Model for Gangrenous Dermatitis in Broiler Chickens
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Abstract

A gangrenous dermatitis model was developed in broiler chickens, in which birds previously vaccinated at 14 days of age with a bursal disease virus vaccine were challenged at 4 wk of age with various bacterial combinations with the combination of subcutaneous and intramuscular injection. Gangrenous dermatitis lesions were not produced in birds injected with one of the Staphylococcus aureus isolates, either alone or in combination with various Clostridium septicum isolates. Other S. aureus isolates produced significant levels of gangrenous dermatitis either alone or in combination with the same C. septicum isolates. These same C. septicum isolates when given alone did not produce gangrenous lesions. Data from this experiment show the highest level of mortality occurred in birds challenged with a mixture of C. septicum and S. aureus isolates, whereas lower or no mortality was associated with the same isolates given separately. The data clearly demonstrate that the pathogenicity of isolates responsible for gangrenous dermatitis varies widely, indicating that the frequency and severity of lesion production, as well as the occurrence of mortality, are largely dependent upon the specific isolate or isolates with which the birds are challenged. /// Se desarrolló un modelo de dermatitis gangrenosa para pollos de engorde, en el cual los pollos que habían sido previamente vacunados a los 14 días de edad contra el virus de la enfermedad infecciosa de la bolsa, fueron desafiados a las 4 semanas de edad con varias combinaciones bacterianas en inyecciones subcutáneas e intramusculares. Las lesiones de dermatitis gangrenosa no se presentaron en los pollos inyectados con uno de los aislados de Staphylococcus aureus, sólo o en combinación con varios aislados de Clostridium septicum. Otros aislados de Staphylococcus aureus produjeron niveles significantes de dermatitis gangrenosa sólos o en combinación con algunos aislados de Clostridium septicum. Estos mismos aislados de Clostridium septicum, cuando se administraron sólos, no produjeron lesiones gangrenosas. Los datos de este experimento mostraron que los altos niveles de mortalidad ocurrieron en los pollos expuestos a la combinación de aislados de Clostridium septicum y Staphylococcus aureus, mientras que los niveles más bajos de mortalidad estuvieron asociados cuando los aislados se administraron separadamente. Los datos demuestran claramente que la patogenicidad de los aislados responsables de la dermatitis gangrenosa varía ampliamente, indicando que la frecuencia y severidad de las lesiones producidas, lo mismo que la mortalidad, dependcn de la especificidad de los aislados usados en el desafio.

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