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Detection of laryngotracheitis virus in poultry flocks with respiratory disorders in Slovenia
ID Zorman-Rojs, Olga (Author), ID Dovč, Alenka (Author), ID Krapež, Uroš (Author), ID Žlabravec, Zoran (Author), ID Račnik, Joško (Author), ID Slavec, Brigita (Author)

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Abstract
Infectious laryngotracheitis (ILT) is an acute, highly contagious infectious disease of the upper respiratory tract in chickens and other poultry species that causes significant economic losses in countries worldwide. Between 2017 and 2019, seven outbreaks of mild to severe respiratory disorders with high suspicion of ILT occurred in commercial and backyard poultry flocks in Slovenia. In all submissions, infection with ILT virus (ILTV) was confirmed by PCR, which is the first report of ILT in Slovenia. Circulating ILT strains were characterized by the sequence and phylogenetic analysis of two fragments of the ICP4 gene. Four strains—three detected in non-vaccinated flocks and one in a flock vaccinated against ILT—were identical or very similar to the chicken embryo–origin live virus vaccines, and the other three were closely related to Russian, Chinese, Australian, and American field strains and to tissue culture origin vaccine strains. As in other diseases, coinfections with other respiratory pathogens in confirmed ILT cases may cause a more severe condition and prolong the course of the disease. In our study, coinfections with Mycoplasma synoviae (7/7 tested flocks), infectious bronchitis virus (5/5 tested flocks), Mycoplasma gallisepticum (4/7 tested flocks), Ornithobacterium rhinotracheale (3/4 tested flocks), and avian pox virus (1/2 tested flocks) were confirmed, indicating the importance of these pathogens in the occurrence of ILT infections.

Language:English
Keywords:chicken, infectious laryngotracheitis, partial ICP4 sequencing, mixed respiratory infections, gallid herpesvirus 1, respiratory tract infections, poultry
Work type:Article (dk_c)
Typology:1.01 - Original Scientific Article
Organization:VF - Veterinary Faculty
Year:2021
Publication status in journal:Published
Article version:Publisher's version of article
Number of pages:12 str.
Numbering:Vol. 13, iss. 4, art. 707
UDC:636.09:616.9:578
ISSN on article:1999-4915
DOI:10.3390/v13040707 This link opens in a new window
COBISS.SI-ID:60544003 This link opens in a new window
Publication date in RUL:12.10.2021
Views:170
Downloads:68
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Record is a part of a journal

Title:Viruses
Shortened title:Viruses
Publisher:MDPI
ISSN:1999-4915
COBISS.SI-ID:517597977 This link opens in a new window

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:19.04.2021

Document is financed by a project

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project number:P4-0092
Name:Zdravje živali, okolje in varna hrana

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