PMID- 32273014 OWN - NLM STAT- MEDLINE DCOM- 20201124 LR - 20201124 IS - 1873-2542 (Electronic) IS - 0378-1135 (Linking) VI - 243 DP - 2020 Apr TI - Pathogenesis and tissue tropism of natural field recombinants of infectious laryngotracheitis virus. PG - 108635 LID - S0378-1135(19)31177-0 [pii] LID - 10.1016/j.vetmic.2020.108635 [doi] AB - Infectious laryngotracheitis virus (ILTV) is an economically significant respiratory pathogen of poultry. Novel recombinant strains of ILTV have emerged in Australia during the last decade and currently class 9 (CL9) and class 10 (CL10) ILTV are the most prevalent circulating strains. This study conducted a comprehensive investigation of the pathogenesis of these two viral strains. Commercial broiler and specific pathogen free (SPF) chickens were inoculated with varying doses of CL9 or CL10 ILTV and subsequently evaluated for clinical and pathological signs of infection. While no difference in the levels of acute viral replication were observed across the different challenge doses, the severity of clinical signs, tracheal pathology and mortality were dose dependent. Both strains of virus persisted in the respiratory tract for up to 14 days post inoculation (dpi) and could be detected in the lung and feathers with sporadic detection in the liver, spleen or bursa. Given the prevalence of CL9 and CL10 in Australian poultry flocks, this study provides an important foundation for the development of diagnostic and therapeutic approaches for the detection and prevention of ILTV. CI - Copyright (c) 2020 Elsevier B.V. All rights reserved. FAU - Thilakarathne, Dulari S AU - Thilakarathne DS AD - Asia-Pacific Centre for Animal Health, Melbourne Veterinary School, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria, 3010, Australia. Electronic address: dthilakarath@student.unimelb.edu.au. FAU - Noormohammadi, Amir H AU - Noormohammadi AH AD - Asia-Pacific Centre for Animal Health, Melbourne Veterinary School, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Werribee, Victoria, 3030, Australia. FAU - Browning, Glenn F AU - Browning GF AD - Asia-Pacific Centre for Animal Health, Melbourne Veterinary School, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria, 3010, Australia. FAU - Quinteros, Jose A AU - Quinteros JA AD - Asia-Pacific Centre for Animal Health, Melbourne Veterinary School, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria, 3010, Australia. FAU - Underwood, Gregory J AU - Underwood GJ AD - Bioproperties Proprietary Limited, 36 Charter Street, Ringwood, Victoria, 3134, Australia. FAU - Hartley, Carol A AU - Hartley CA AD - Asia-Pacific Centre for Animal Health, Melbourne Veterinary School, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria, 3010, Australia. FAU - Coppo, Mauricio Jc AU - Coppo MJ AD - Asia-Pacific Centre for Animal Health, Melbourne Veterinary School, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria, 3010, Australia. FAU - Devlin, Joanne M AU - Devlin JM AD - Asia-Pacific Centre for Animal Health, Melbourne Veterinary School, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria, 3010, Australia. FAU - Diaz-Mendez, Andres AU - Diaz-Mendez A AD - Asia-Pacific Centre for Animal Health, Melbourne Veterinary School, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria, 3010, Australia. LA - eng PT - Journal Article DEP - 20200304 PL - Netherlands TA - Vet Microbiol JT - Veterinary microbiology JID - 7705469 SB - IM MH - Animals MH - Australia MH - Chickens/*virology MH - Feathers/virology MH - Genotype MH - Herpesviridae Infections/*veterinary MH - Herpesvirus 1, Gallid/genetics/*pathogenicity MH - Lung/virology MH - Poultry Diseases/*virology MH - Reassortant Viruses/pathogenicity MH - Specific Pathogen-Free Organisms MH - *Viral Tropism MH - Virus Replication OTO - NOTNLM OT - ILTV OT - Natural field recombinants OT - Pathogenesis OT - Tissue tropism COIS- Declaration of Competing Interest The authors have declared that they have no competing interests. EDAT- 2020/04/11 06:00 MHDA- 2020/11/25 06:00 CRDT- 2020/04/11 06:00 PHST- 2019/10/05 00:00 [received] PHST- 2020/02/28 00:00 [revised] PHST- 2020/03/03 00:00 [accepted] PHST- 2020/04/11 06:00 [entrez] PHST- 2020/04/11 06:00 [pubmed] PHST- 2020/11/25 06:00 [medline] AID - S0378-1135(19)31177-0 [pii] AID - 10.1016/j.vetmic.2020.108635 [doi] PST - ppublish SO - Vet Microbiol. 2020 Apr;243:108635. doi: 10.1016/j.vetmic.2020.108635. Epub 2020 Mar 4.