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The complete genome length of the calicivirus strain gull\/HA15097\/HUN\/2018 (PZ810127) is remarkably long, 8,845 nucleotides, which had type IV internal ribosomal entry site (IRES) at the 5\u2019, and a stem-loop-II-like (s2m) sequence motif at the 3\u2019 untranslated regions. The VP1 capsid protein had less than 26% aa identity to the members of the known calicivirus genera. Caliciviruses appear to be widespread not only in mammals including humans but also in various bird species.\n                  <\/jats:p>","DOI":"10.1007\/s00705-026-06733-y","type":"journal-article","created":{"date-parts":[[2026,9,2]],"date-time":"2026-09-02T14:04:36Z","timestamp":1788357876000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Novel avian calicivirus genome with type IV internal ribosomal entry site (IRES) in black-headed gull (Chroicocephalus ridibundus) in Hungary"],"prefix":"10.1007","volume":"171","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5857-4934","authenticated-orcid":false,"given":"G\u00e1bor","family":"Reuter","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Benigna","family":"Bal\u00e1zs","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R\u00f3bert","family":"M\u00e1tics","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5843-4360","authenticated-orcid":false,"given":"\u00c1kos","family":"Boros","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9419-2522","authenticated-orcid":false,"given":"P\u00e9ter","family":"Pankovics","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,9,2]]},"reference":[{"issue":"11","key":"6733_CR1","doi-asserted-by":"publisher","first-page":"1469","DOI":"10.1099\/jgv.0.001332","volume":"100","author":"J Vinj\u00e9","year":"2019","unstructured":"Vinj\u00e9 J, Estes MK, Esteves P, Green KY, Katayama K, Knowles NK, L\u2019Homme Y, Martella V, Vennema H, White PA (2019) ICTV virus taxonomy profile: Caliciviridae. 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