Synergy between avian pneumovirus andOrnithobacterium rhinotrachealein turkeys

Autor:	An Martel, Hans Nauwynck, Annemie Decostere, Robrecht Froyman, Koen Chiers, M. Marien
Rok vydání:	2005
Předmět:	Turkeys Pathology medicine.medical_specialty Time Factors Food Animals Flavobacteriaceae Infections medicine Animals Poultry Diseases Ornithobacterium rhinotracheale Histological examination Specific-pathogen-free Air sacs Paramyxoviridae Infections General Immunology and Microbiology Inoculation business.industry Respiratory disease medicine.disease Ornithobacterium Virology Specific Pathogen-Free Organisms Avian pneumovirus medicine.anatomical_structure Animal Science and Zoology Metapneumovirus business Respiratory tract
Zdroj:	Avian Pathology. 34:204-211
ISSN:	1465-3338 0307-9457
Popis:	The purpose of this study was to assess the possible synergism between Ornithobacterium rhinotracheale (ORT) and avian pneumovirus (APV), inoculated into turkeys via the natural route, for the reproduction of respiratory disease. Three-week-old specific pathogen free turkeys were inoculated oculonasally with either APV subtype A, ORT or both agents using two different time intervals (3 and 5 days) between APV and ORT. The birds were observed clinically on a daily basis and swabbed intratracheally at short, regular intervals. They were killed at 1, 3, 5, 8 and 15 days post single or dual inoculation and examined for gross lesions at necropsy. Samples of the turbinates, trachea, lungs, air sacs, heart, pericardium and liver were taken for bacteriological and/or histological examination. Combined APV/ORT infections resulted in overt clinical signs and a longer persistence of ORT in the respiratory tract and aggravated the macroscopic and histological lesions in comparison with the groups given single infections. In all ORT-challenged turkeys, ORT was isolated from the turbinates, trachea and lungs, but in turkeys infected with both agents ORT was frequently found in the air sacs and on a single occasion in the heart and pericardium. The time interval between APV and ORT inoculation did not have a significant effect on the outcome of the dual infection. A conspicuous important feature was the attachment of ORT to the cilia of the epithelium of the turbinates and trachea of both ORT-infected and APV/ORT-infected birds. In conclusion, the results show that ORT is able to adhere to and colonize the respiratory tract but, under the circumstances used in this study, is not capable of inducing respiratory disease without viral priming.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::57888b5c0ddf887d5195ba54f50ec849 https://doi.org/10.1080/03079450500096414 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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