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A total of 150 samples were collected from 30 vaccinated commercial broiler chicken farms and pooled into 30 working samples. IBDV was tested using reverse transcriptase polymerase chain reaction (RT-PCR) amplification of the hypervariable region of the viral protein 2 (hvVP2) and the VP1 gene 5\u2019 extremity. Both RT-PCR fragments were sequenced from six samples, and then the obtained nucleotide sequences were analyzed. The IBDV genotypes were identified using nucleotide sequences. Five sequences of the six strains examined were classified as genotype A3B2 for the highly virulent segments A and B (vv-A\/vv-B IBDV). Interestingly, this study identified and classified a novel\u00a0segment-reassortant strain\u00a0as the A1B2 genotype. Specifically, it involved the segment reassortment of classical virulent segment A (cv-A) with vv-B producing cv-A\/vv-B reassortant IBDV. Subsequently, we compared the pathogenicity of reassortant (cv-A\/vv-B) IBDV and vvIBDV strains identified in this study. Both strains developed typical IBD clinical signs, postmortem lesions, histopathology, immunohistochemistry, and lesion scores, which were more severe in vvIBDV than reassortant IBDV. In conclusion, this is the first report of the genotype classification based on both genome segments (hvVP2 and VP1) with pathogenicity of IBDV circulating in vaccinated broiler chicken farms and this pathogenicity is more severe in vvIBDV strain than a novel reassortant IBDV strain.<\/jats:p>","DOI":"10.1007\/s11259-024-10468-z","type":"journal-article","created":{"date-parts":[[2024,7,30]],"date-time":"2024-07-30T15:03:55Z","timestamp":1722351835000},"page":"3089-3104","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Genotype classification and pathogenicity of infectious bursal disease virus circulating in vaccinated broiler chicken farms"],"prefix":"10.1007","volume":"48","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4533-4904","authenticated-orcid":false,"given":"Samah M.","family":"Mosad","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mona M.","family":"Elsayed","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Enas M.","family":"Hammad","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Basma M.","family":"Hendam","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hanaa S.","family":"Ali","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8404-8850","authenticated-orcid":false,"given":"Abdelfattah H.","family":"Eladl","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9320-9900","authenticated-orcid":false,"given":"Mohamed A.","family":"Saif","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,7,30]]},"reference":[{"key":"10468_CR1","first-page":"633","volume":"53","author":"J Akhila","year":"2022","unstructured":"Akhila J, Sreeja R, Ambily R, Mini M, Sajitha I (2022) Sequence analysis of VP1, VP2 and VP3 genes of infectious bursal disease virus from a field outbreak in Kerala, India. 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