{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,24]],"date-time":"2026-08-24T12:26:00Z","timestamp":1787574360598,"version":"build-2736575974"},"reference-count":34,"publisher":"MDPI AG","issue":"17","license":[{"start":{"date-parts":[[2026,8,23]],"date-time":"2026-08-23T00:00:00Z","timestamp":1787443200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100004539","name":"Kasetsart University","doi-asserted-by":"publisher","award":["Thailand Project 2025"],"award-info":[{"award-number":["Thailand Project 2025"]}],"id":[{"id":"10.13039\/501100004539","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004539","name":"Kasetsart University","doi-asserted-by":"publisher","award":["Faculty of Veterinary Medicine, Kasetsart University"],"award-info":[{"award-number":["Faculty of Veterinary Medicine, Kasetsart University"]}],"id":[{"id":"10.13039\/501100004539","id-type":"DOI","asserted-by":"publisher"}]},{"award":["Thailand Project 2025"],"award-info":[{"award-number":["Thailand Project 2025"]}],"id":[{"id":"https:\/\/ror.org\/05gzceg21","id-type":"ROR","asserted-by":"publisher"}]},{"award":["Faculty of Veterinary Medicine, Kasetsart University"],"award-info":[{"award-number":["Faculty of Veterinary Medicine, Kasetsart University"]}],"id":[{"id":"https:\/\/ror.org\/05gzceg21","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Int. J. Mol. Sci.","IJMS"],"abstract":"<jats:p>PCR-based surveillance identified the infectious laryngotracheitis virus (ILTV) genome in 8 out of 14 (57.14%) commercial broiler farms across three Northern Vietnam provinces. Partial sequencing of the infected cell protein 4 (ICP4) and glycoprotein B, G, and J (gB, gG, and gJ) genes from the ILTV isolates obtained during 2023\u20132025 indicated that eight Vietnamese ILTV-positive samples were field ILTV strains. Additionally, high nucleotide identity was observed among the isolates, with ranges of 99.74\u2013100% for the gB, 99.63\u2013100% for the gJ, 99.66\u2013100% for the gG, and 99.34\u2013100% for the ICP4 genes. Phylogenetic analyses based on four genes (gB, gJ, gG, and ICP4) revealed that the eight ILTV strains belonged to two distinct lineages, except for the gJ gene. Analysis of the ICP4 gene showed that the five ILTV strains (VNUA-ILTV-02, VNUA-ILTV-05 to VNUA-ILTV-08) clustered with the United States Laryno Vac, Poulvac-ILT, and ON-2462242\/1987 strains, whereas the remaining strains (VNUA-ILTV-01, VNUA-ILTV-03, and VNUA-ILTV-04) were in a distinct group. Furthermore, several amino acid changes were observed in the gB, gG, and gJ proteins of the characterized ILTV strains.<\/jats:p>","DOI":"10.3390\/ijms27177544","type":"journal-article","created":{"date-parts":[[2026,8,24]],"date-time":"2026-08-24T11:47:19Z","timestamp":1787572039000},"page":"7544","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Molecular Characterization of Infectious Laryngotracheitis Virus from Broiler Diseased Chickens in Northern Vietnam During 2023\u20132025"],"prefix":"10.3390","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0841-3358","authenticated-orcid":false,"given":"Giang Thi Huong","family":"Tran","sequence":"first","affiliation":[{"name":"Faculty of Veterinary Medicine, Vietnam National University of Agriculture, Hanoi 131000, Vietnam"},{"name":"Center for Advanced Studies for Agriculture and Food, Kasetsart University Institute for Advanced Studies, Kasetsart University, Bangkok 10900, Thailand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-1770-7930","authenticated-orcid":false,"given":"Vuong Trong","family":"Tran","sequence":"additional","affiliation":[{"name":"National Center for Veterinary Diagnosis No. 2, Department of Animal Health and Production, Ministry of Agriculture and Environment, Hanoi 131000, Vietnam"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Amonpun","family":"Rattanasrisomporn","sequence":"additional","affiliation":[{"name":"Interdisciplinary of Genetic Engineering and Bioinformatics, Graduate School, Kasetsart University, Bangkok 10900, Thailand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6340-9204","authenticated-orcid":false,"given":"Hieu Van","family":"Dong","sequence":"additional","affiliation":[{"name":"Faculty of Veterinary Medicine, Vietnam National University of Agriculture, Hanoi 131000, Vietnam"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Autchara","family":"Kayan","sequence":"additional","affiliation":[{"name":"Center for Advanced Studies for Agriculture and Food, Kasetsart University Institute for Advanced Studies, Kasetsart University, Bangkok 10900, Thailand"},{"name":"Department of Animal Science, Faculty of Agriculture, Kasetsart University, Bangkok 10900, Thailand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2426-0961","authenticated-orcid":false,"given":"Jatuporn","family":"Rattanasrisomporn","sequence":"additional","affiliation":[{"name":"Center for Advanced Studies for Agriculture and Food, Kasetsart University Institute for Advanced Studies, Kasetsart University, Bangkok 10900, Thailand"},{"name":"Department of Companion Animal Clinical Sciences, Faculty of Veterinary Medicine, Kasetsart University, Bangkok 10900, Thailand"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,8,23]]},"reference":[{"key":"ref_1","unstructured":"King, A., Carstens, E.B., and Lefkowitz, E.J. 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