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Experimental Horizontal Transmission of Salmonella enteritidis Strains (Phage Types 4, 8, and 13A) in Chicks

Richard K. Gast and Peter S. Holt
Avian Diseases
Vol. 43, No. 4 (Oct. - Dec., 1999), pp. 774-778
DOI: 10.2307/1592747
Stable URL: http://www.jstor.org/stable/1592747
Page Count: 5
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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.
Experimental Horizontal Transmission of Salmonella enteritidis Strains (Phage Types 4, 8, and 13A) in Chicks
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Abstract

The recent isolation of phage type 4 Salmonella enteritidis strains from poultry and humans in the United States has generated considerable concern because this phage type is predominant in both animals and humans in many other nations. Understanding whether the presence of these strains in poultry flocks poses an elevated threat to public health is a critical issue for developing effective disease control programs. The present study evaluated whether S. enteritidis strains of various phage types found in poultry in the United States (phage types 4, 8, and 13a) differed in their potential for horizontal transmission from experimentally infected chicks to uninoculated chicks housed in the same isolator units. Five days after two seeder chicks in each group of 12 were inoculated with oral doses of approximately 103 S. enteritidis cells at 8 days of age, ceca and livers were sampled from seeder chicks and from their contact-exposed penmates. On the basis of the detection of S. enteritidis in cecal samples, phage type 4 strains were transmitted horizontally at a significantly lower frequency than were strains of other phage types. Nevertheless, two of three phage type 4 strains evaluated were very highly invasive. /// El aislamiento reciente de Salmonella enteritidis fagotipo 4 a partir de aves y humanos en los Estados Unidos ha generado gran preocupación porque este fagotipo es predominante tanto en animales como en humanos en muchos otros países. El conocimiento de si estas cepas aviares presentan un alto riesgo para la salud pública es un punto crítico en el desarrollo de programas efectivos de control de enfermedades. El presente estudio se realizó para determinar si varios fagotipos de Salmonella enteritidis (4, 8 y 13a) encontrados en la avicultura de los Estados Unidos difieren en su potencial de transmisión horizontal de aves infectadas experimentalmente a aves no infectadas alojadas en las mismas unidades de aislamiento. En cada uno de los grupos de doce pollitos de ocho días de edad, dos pollitos fueron inoculados con una dosis oral de 103 células de S. enteritidis y cinco días más tarde se tomaron muestras de ciego e hígado de los pollitos inoculados y de los pollitos expuestos por contacto. Basados en la detección de S. enteritidis en muestras de ciego, el fagotipo 4 de S. enteritidis fue transmitido horizontalmente con una frecuencia significantemente más baja que las cepas de los otros fagotipos. Sin embargo, dos ó tres cepas fagotipo 4 que fueron evaluadas fueron altamente invasivas.

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