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Isolation ofActinobacillus pleuropneumoniaefrom Layer Hens Showing Clinical Signs of Infectious Coryza

Actinobacillus pleuropneumoniaeis the causal agent of porcine pleuropneumonia, which is a highly contagious respiratory disease that affects swine nearly exclusively. An isolate with characteristics of somePasteurellaceaefamily members (Gram-negative bacterium, pleomorphic, and NAD-dependent) was is...

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Published in:Avian diseases 2014-12, Vol.58 (4), p.638-641
Main Authors: Márquez, V. M. Pérez, Ochoa, J. López, Cruz, C. Vázquez, Alonso, P. Sánchez, Olmedo-Alvarez, G., P, S. Vaca, Abascal, E. Negrete
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container_title Avian diseases
container_volume 58
creator Márquez, V. M. Pérez
Ochoa, J. López
Cruz, C. Vázquez
Alonso, P. Sánchez
Olmedo-Alvarez, G.
P, S. Vaca
Abascal, E. Negrete
description Actinobacillus pleuropneumoniaeis the causal agent of porcine pleuropneumonia, which is a highly contagious respiratory disease that affects swine nearly exclusively. An isolate with characteristics of somePasteurellaceaefamily members (Gram-negative bacterium, pleomorphic, and NAD-dependent) was isolated from layer hens showing clinical signs of infectious coryza. This bacterium presented hemolysis on rabbit red blood cell agar plates, and PCR amplification and sequencing of its 16S rDNA gene indicated 99% identity withA. pleuropneumoniaeserotypes 3 and 7. The presence of a putativeapxIIA gene was also determined by PCR. A single, smooth colony of this bacterium inoculated in five, 7-day-old chicken embryos via the yolk sac route induced 100% mortality. However, inoculation into 10-wk-old, specific-pathogen-free chickens induced only light facial swelling, and reisolation of the inoculated bacterium was negative. Actinobacillus pleuropneumoniaees el agente causal de la pleuroneumonía porcina, una enfermedad respiratoria altamente contagiosa que ha sido considerada que afecta casi exclusivamente a los cerdos. Se obtuvo un aislamiento con características de algunos de los miembros de la familiaPasteurellaceae(bacteria Gram negativa, pleomórfica y dependiente de NAD) a partir de gallinas de postura que mostraban signos clínicos de coriza infecciosa. Esta bacteria produjo hemólisis en placas de agar sangre de conejo. La amplificación por PCR del gene rDNA 16S y su secuenciación indicó una identidad del 99% con el rDNA deA. pleuropneumoniaeserotipos 3 y 7. La presencia de un supuesto geneapxIIA también determinada por PCR. Cuando se inocularon cinco huevos embrionados de pollo de siete días de edad con una colonia lisa de esta bacteria a través del saco vitelino se observó 100% de mortalidad. Sin embargo, su inoculación en aves libres de patógenos específicos de 10 semanas de edad indujo únicamente una inflamación facial ligera, y el re-aislamiento de la bacteria inoculada fue negativo.
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A single, smooth colony of this bacterium inoculated in five, 7-day-old chicken embryos via the yolk sac route induced 100% mortality. However, inoculation into 10-wk-old, specific-pathogen-free chickens induced only light facial swelling, and reisolation of the inoculated bacterium was negative. Actinobacillus pleuropneumoniaees el agente causal de la pleuroneumonía porcina, una enfermedad respiratoria altamente contagiosa que ha sido considerada que afecta casi exclusivamente a los cerdos. Se obtuvo un aislamiento con características de algunos de los miembros de la familiaPasteurellaceae(bacteria Gram negativa, pleomórfica y dependiente de NAD) a partir de gallinas de postura que mostraban signos clínicos de coriza infecciosa. Esta bacteria produjo hemólisis en placas de agar sangre de conejo. La amplificación por PCR del gene rDNA 16S y su secuenciación indicó una identidad del 99% con el rDNA deA. pleuropneumoniaeserotipos 3 y 7. 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subjects Actinobacillus
Bacteria
Case Reports
Chickens
Edema
Embryos
Microorganisms
Phylogenetics
Polymerase chain reaction
Ribosomal DNA
Toxins
title Isolation ofActinobacillus pleuropneumoniaefrom Layer Hens Showing Clinical Signs of Infectious Coryza
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