Impact Factor:3.352
DOI number:10.1016/j.psj.2021.101523
Affiliation of Author(s):Yangzhou University
Journal:Poultry Science
Key Words:Avibacterium paragallinarum, infectious coryza, pathogenicity, chicken, innate immunity
Abstract:Infectious coryza (IC) is an acute infectious upper respiratory disease in chickens. Recently, the prevalence of IC has increased in China. In this study, to clarify the pathogenic mechanism and innate immune response of Avibacterium paragallinarum (A. paragallinarum), an infection experiment with A. paragallinarum was conducted. Our results showed that the whole course of IC was approximately 7 d. The clinical signs score was highest at 3 dpi and decreased from 5 dpi. A large amount of mucus and exudates was found in the infraorbital sinuses and nasal cavity. The A. paragallinarum contents in blood remained the highest, reaching 9.16 x 10(5) CFU/g at 5 dpi, which indicated that A. paragallinarum could rapidly invade the host, replicate in the blood and cause bacteremia. A. paragallinarum targets the upper respiratory tract. The infiltration of inflammatory cells, macrophages, and heterophilic granulocytes was only observed in the nasal cavity and infraorbital sinus. The Tlr4 and Nod1 pathways were activated and induced proinflammatory responses in chickens after infection with A. paragallinarum. The expression of Il1beta and Il6 in the nasal cavity was significantly higher than that in the spleen, and it was consistent with the gross lesions and pathological changes. In particular, the expression of Il6 increased 229.07-fold at 1 dpi in the nasal cavity and increased 3.12-fold in the spleen. The high level of proinflammatory cytokines in the nasal cavity at an early stage of infection may be the main factor related to acute upper respiratory inflammation in chickens. These findings provide a reference for the occurrence and development of diseases mediated by A. paragallinarum.
Co-author:Donghui Liu,Xiufang Chen,Yantao Wu
First Author:Mengjiao Guo
Indexed by:Research Atricle
Correspondence Author:Xiaorong Zhang
Discipline:Agricultural science
First-Level Discipline:Veterinary Medicine
Document Type:J
Volume:101
Issue:1
Page Number:101523
ISSN No.:1525-3171
Translation or Not:no
Date of Publication:2021-11-17
Included Journals:SCI