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Phylogenetic analysis confirmed the presence of the pathogenic RHEV genotype C1 in the Helsinki region. Finnish strains clustered together with strains from South Korea and Spain. However, the polytomous topology of phylogenetic trees and the large genetic distances between spatially distinct strains suggest that RHEV has remained inadequately sampled on a global scale. Further surveillance of rocahepeviruses is needed to assess their threat to public health and to understand their diversity and evolutionary patterns. <\/jats:p>","DOI":"10.1007\/s00705-025-06412-4","type":"journal-article","created":{"date-parts":[[2025,9,29]],"date-time":"2025-09-29T19:55:15Z","timestamp":1759175715000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Genetic characterization of rat hepatitis E virus (Rocahepevirus ratti) in urban brown rats (Rattus norvegicus) in Helsinki, Finland"],"prefix":"10.1007","volume":"170","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7285-1654","authenticated-orcid":false,"given":"Mert","family":"Erdin","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7903-6986","authenticated-orcid":false,"given":"Eda","family":"Altan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-9472-6141","authenticated-orcid":false,"given":"Nina","family":"Suomalainen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7847-3762","authenticated-orcid":false,"given":"Hussein","family":"Alburkat","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4285-7179","authenticated-orcid":false,"given":"Tuomas","family":"Aivelo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2344-2755","authenticated-orcid":false,"given":"Tarja","family":"Sironen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9187-3151","authenticated-orcid":false,"given":"Teemu","family":"Smura","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,9,29]]},"reference":[{"key":"6412_CR1","doi-asserted-by":"crossref","unstructured":"Purdy MA, Drexler JF, Meng XJ, Norder H, Okamoto H, Van der Poel WHM, Reuter G, de Souza WM, Ulrich RG, Smith DB (2022) ICTV virus taxonomy profile: hepeviridae 2022. 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