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Evaluation of the Efficacy of an Oil-Emulsion Bacterin for Protecting Chickens against Salmonella enteritidis

Richard K. Gast, Henry D. Stone, Peter S. Holt and C. W. Beard
Avian Diseases
Vol. 36, No. 4 (Oct. - Dec., 1992), pp. 992-999
DOI: 10.2307/1591560
Stable URL: http://www.jstor.org/stable/1591560
Page Count: 8
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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.
Evaluation of the Efficacy of an Oil-Emulsion Bacterin for Protecting Chickens against Salmonella enteritidis
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Abstract

To assess the potential protective efficacy of a Salmonella enteritidis bacterin, an acetone-killed oil-emulsion vaccine was prepared from a phage type 13a S. enteritidis strain and administered subcutaneously to hens in two experiments. Hens were housed individually, and every other hen was vaccinated (at 23 weeks of age in one experiment and at 45 weeks in the other). A second (booster) bacterin injection was administered 6 weeks later in both experiments. Three weeks after the second vaccination, all hens were challenged with an oral dose of approximately 109 cells of a heterologous (phage type 14b) S. enteritidis strain. In both trials, S. enteritidis was isolated from fewer internal organs (spleens, ovaries, and oviducts) and pools of egg contents from vaccinated hens than from unvaccinated control hens. Vaccination did not, however, affect the percentage of hens that shed S. enteritidis in feces in either experiment. /// Para establecer el potencial efectivo protector de una bacterina de Salmonella enteritidis, se preparó una vacuna inactivada con acetona y emulsionada en aceite a partir de una cepa con fago tipo 13a. El producto se utilizó en dos experimentos por vía subcutánea. Las gallinas se alojaron en jaulas individuales, vacunando la mitad de ellas alternadamente, a las 23 semanas de edad en un experimento y a las 45 semanas de edad en el otro. Una segunda inyección de una bacterina (revacunación) fue administrada 6 semanas más tarde en los dos experimentos. Tres semanas después de la segunda vacunación, todas las gallinas fueron desafiadas con una dosis oral de aproximadamente 109 bacterias de una cepa heteróloga de S. enteritidis (fago tipo 14b). En los dos experimentos, la S. enteritidis se aisló de menos órganos (bazos, ovarios y oviductos) y huevos de gallinas vacunadas que de los controles no vacunados. Sin embargo, en ambos experimentos, la vacunación no afectó el porcentaje de gallinas que eliminaron la S. enteritidis en las heces.

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