{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,12]],"date-time":"2026-06-12T16:03:53Z","timestamp":1781280233002,"version":"3.54.1"},"reference-count":37,"publisher":"Microbiology Society","issue":"6","license":[{"start":{"date-parts":[[2026,6,9]],"date-time":"2026-06-09T00:00:00Z","timestamp":1780963200000},"content-version":"unspecified","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100010586","name":"Haukeland Universitetssjukehus","doi-asserted-by":"crossref","id":[{"id":"10.13039\/501100010586","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,6,9]]},"abstract":"<jats:p>\n                    Recent genome-based phylogenetic investigations of the\n                    <jats:italic>Fusobacterium nucleatum<\/jats:italic>\n                    group have revealed that genomes currently annotated as\n                    <jats:italic>F. nucleatum<\/jats:italic>\n                    (sensu stricto) bifurcate into two separate phylogenetic groups: a large cluster containing the\n                    <jats:italic>F. nucleatum<\/jats:italic>\n                    type strain and a smaller cluster possibly representing a novel species. To further investigate this, we searched our strain archive for\n                    <jats:italic>Fusobacterium<\/jats:italic>\n                    isolates potentially representing the smaller cluster. A strain Vestland17\n                    <jats:sup>T<\/jats:sup>\n                    , cultured from a polymicrobial brain abscess, had been found to share less than 99% similarity with the\n                    <jats:italic>F. nucleatum<\/jats:italic>\n                    type strain by partial 16S rRNA gene sequencing. The isolate grew on blood agar with dry whitish colonies (0.5\u20131\u2009mm) after 24\u201348\u2009h of anaerobic incubation. Genome-based phylogenetic analyses confirmed that it belonged to the smaller\n                    <jats:italic>F. nucleatum<\/jats:italic>\n                    outlier cluster. We further confirmed the presence of this outlier cluster in four additional historic brain abscess samples using specific amplification and sequencing of the\n                    <jats:italic>dnaB<\/jats:italic>\n                    gene directly from remnant extracted DNA stored in our diagnostic biobank. A core-genome phylogenetic tree including the novel strain Vestland17\n                    <jats:sup>T<\/jats:sup>\n                    and several more recent GenBank whole-genome references reproduced the previously observed bifurcation within the\n                    <jats:italic>F. nucleatum<\/jats:italic>\n                    (sensu stricto) species. Average Nucleotide Identities (ANI) between the two clusters are in the range 94.7\u201395.2%, supporting that the smaller cluster represents a different species as per a 95\u201396% ANI threshold. This was further supported by alternative strategies based on the biological species concept. For this species, we propose the name\n                    <jats:italic>Fusobacterium abscessus<\/jats:italic>\n                    . The type strain of\n                    <jats:italic>F. abscessus<\/jats:italic>\n                    is Vestland17\n                    <jats:sup>T<\/jats:sup>\n                    (DSM 121298\n                    <jats:sup>T<\/jats:sup>\n                    , NCTC 15275\n                    <jats:sup>T<\/jats:sup>\n                    ).\n                  <\/jats:p>","DOI":"10.1099\/ijsem.0.007199","type":"journal-article","created":{"date-parts":[[2026,6,12]],"date-time":"2026-06-12T15:15:51Z","timestamp":1781277351000},"source":"Crossref","is-referenced-by-count":0,"title":["Fusobacterium abscessus sp. nov., associated with brain abscess in humans"],"prefix":"10.1099","volume":"76","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4390-0370","authenticated-orcid":false,"given":"\u00d8yvind","family":"Kommedal","sequence":"first","affiliation":[{"name":"Department of Microbiology, Haukeland University Hospital, Bergen, Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Diego","family":"Forni","sequence":"additional","affiliation":[{"name":"Scientific Institute IRCCS E. 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