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Low Persistence of a Large-Plasmid-Cured Variant of Salmonella enteritidis in Ceca of Chicks
In order to estimate the contribution of Salmonella in the persistence of this bacterium in chicks, we compared the persistence of a Salmonella enteritidis strain and its plasmid-cured variant in a chicken asymptomatic carrier state model. After oral inoculation, colonization with the plasmid-cured...
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Published in: | Avian diseases 2003-01, Vol.47 (1), p.163-168 |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Online Access: | Get full text |
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Summary: | In order to estimate the contribution of Salmonella in the persistence of this bacterium in chicks, we compared the persistence of a Salmonella enteritidis strain and its plasmid-cured variant in a chicken asymptomatic carrier state model. After oral inoculation, colonization with the plasmid-cured strain was significantly reduced (P < 0.001) in the ceca of chicks from the third week postinoculation and persisted for a shorter period than the wild-type strain. Moreover, numbers of S. enteritidis-infected livers were also significantly lower (P < 0.01) for the plasmid-cured strain compared with the wild-type strain from the third to the seventh week postinoculation. No difference in spleen colonization was observed. These results did not correlate with any in vitro difference in attachment, entry to, or intracellular multiplication of bacteria within intestinal or macrophage avian cell lines.Original Abstract: Nota de Investigacion -Baja persistencia de una variante de Salmonella enteritidis privada de un gran plasmido, en el ciego de pollos. not equal to on el objeto de estimar la persistencia de la Salmonella en los pollos, se comparo la persistencia de una cepa de Salmonella enteritidis y su variante privada de gran plasmido, en un modelo aviar de portador asintomatico. Despues de la inoculacion oral, la colonizacion con el organismo sin el plasmido fue reducida significantemente (P < 0.001) en el ciego de pollos desde la tercera semana despues de la inoculacion y persistio por un corto periodo, comparado con la cepa normal. Ademas, el numero de higados infectados con S. enteritidis fue tambien significantemente menor (P < 0.01) para la cepa carente del plasmido comparada con la cepa normal, desde la tercera hasta la septima semana despues de la inoculacion. No se observaron diferencias en la colonizacion del bazo. Estos resultados no mostraron correlacion con ninguna diferencia in vitro en la adhesion, entrada o multiplicacion intracelular de la bacteria dentro de lineas celulares aviares intestinales o macrofagos. double prime bbreviations: CFU = colony-forming units; LD50 = mean lethal dose; Nal = nalidixic acid; PE = plasmid encoded; PI = postinoculation; Sm = streptomycin |
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ISSN: | 0005-2086 |
DOI: | 10.1043/0005-2086(2003)047(0163:LPOALP)2.0.CO;2 |