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• W2043011441 abstract "Avibacterium paragallinarum causes infectious coryza in chickens, an acute respiratory disease that has worldwide economic significance. The objectives of this study were to determine the serovars, antimicrobial resistance, and pathogenicity of A. paragallinarum isolated from chickens in Thailand. Eighteen field isolates of A. paragallinarum were confirmed by PCR. When examined by serotyping in a hemagglutination inhibition test, 10 isolates were serovar A, five isolates were serovar B, and three isolates were serovar C. The susceptibility of the isolates to 16 antimicrobial agents was tested by a disk diffusion method. All isolates were susceptible to amoxicillin–clavulanic acid. There was a high level of resistance to lincomycin and erythromycin. All isolates were resistant to cloxacillin and neomycin. A study of bacterial entry into, and survival within, chicken macrophages showed variation between isolates but no clear connection to serovar. A virulence test was performed by challenging 4-wk-old layers via the nasal route with 400 µl of bacteria (108 colony-forming units/ml). Clinical signs were observed daily for 7 days, and the birds were subjected to a postmortem necropsy at 7 days postchallenge. All 18 field isolates caused the typical clinical signs of infectious coryza and could be re-isolated at 7 days after challenge. There was no significant difference in the clinical scores of the isolates except that two isolates (112179 and 102984, serovars A and B, respectively) gave a significantly higher score than did isolate CMU1009 (a serovar A isolate). No correlation between serovar and severity of clinical signs was found.Identificación de serovariedades, sensibilidad a los antibióticos y virulencia de aislamientos de Avibacterium paragallinarum de pollos en Tailandia.Avibacterium paragallinarum produce coriza infecciosa en los pollos, que es una enfermedad respiratoria aguda que tiene una importancia económica a nivel mundial. Los objetivos de este estudio fueron determinar las serovariedades, la resistencia antimicrobiana y la patogenicidad de A. paragallinarum aislados de pollos en Tailandia. Dieciocho aislamientos de campo de A. paragallinarum fueron confirmados por PCR. Cuando se examinaron mediante serotipificación con una prueba de inhibición de la hemaglutinación, diez aislamientos se clasificaron como serovariedad A, cinco aislamientos como serovariedad B, y tres aislamientos como serovariedad C. La susceptibilidad de los aislamientos a 16 agentes antimicrobianos se puso a prueba mediante un método de difusión en disco. Todos los aislados fueron sensibles a amoxicilina-ácido clavulánico. Se observó un alto nivel de resistencia a la lincomicina y a la eritromicina. Todos los aislados fueron resistentes a la cloxacilina y a la neomicina. Un estudio de fagocitosis y de supervivencia bacteriana en el interior de macrófagos, mostró variación entre los aislamientos, pero no se observó ninguna conexión clara con la serovariedad. Se realizó una prueba de virulencia mediante el desafío de pollas de una estirpe productora de huevo, de cuatro semanas de edad a través de la vía nasal con 400 µl de bacterias (108 unidades formadoras de colonias / ml). Los signos clínicos se observaron diariamente durante siete días, y las aves fueron sometidas a una necropsia a los siete días después del desafío. Todos los 18 aislamientos de campo causaron los signos clínicos típicos de coriza infecciosa y esta pudo ser reaislada a los siete días después del desafío. No hubo diferencias significativas en las puntuaciones clínicas de los aislamientos, excepto que dos cepas (112179 y 102984, clasificados como serovariedades A y B, respectivamente), produjeron puntuaciones significativamente más altas a las observadas con el aislamiento CMU1009 (un aislamiento serovariedad A). No se observó correlación entre serovariedad y la severidad de los signos clínicos." @default.
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• W2043011441 date "2012-06-01" @default.
• W2043011441 modified "2023-10-16" @default.
• W2043011441 title "Serovar Identification, Antimicrobial Sensitivity, and Virulence of Avibacterium paragallinarum Isolated from Chickens in Thailand" @default.
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• W2043011441 doi "https://doi.org/10.1637/9881-080811-reg.1" @default.
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