Brown Phillip, Moura Alexandra, Valès Guillaume, Tessaud-Rita Nathalie, Niedermeyer Jefffrey, Parsons Cameron, Leclercq Alexandre, Harris Angela, Emanuel Ryan E, Kathariou Sophia, Lecuit Marc
Department of Plant and Microbial Biology, North Carolina State University, Raleigh, North Carolina, USA.
Institut Pasteur, Université Paris Cité, Listeria National Reference Center and WHO Collaborating Center, Paris, France.
Int J Syst Evol Microbiol. 2025 May;75(5). doi: 10.1099/ijsem.0.006774.
In September 2018, Hurricane Florence resulted in major flooding in North Carolina, USA. Efforts to isolate and other spp. from Hurricane Florence floodwaters repeatedly yielded non-haemolytic -like isolates that could not be readily assigned to known taxa. Whole-genome sequence analyses against the 28 currently known species confirmed that the isolates constitute two new taxa within the genus . Taxon I, with one isolate, showed the highest similarity to with an average nucleotide identity blast of 85.3±4.4% and an DNA-DNA hybridization (DDH) of 32.4% (range: 30-35%), differing from the latter by its ability to reduce nitrate, ferment d-ribose and sucrose, and by its inability to produce catalase or ferment d-trehalose and d-lactose. Taxon II, represented by 11 isolates, showed the highest similarity to with an average nucleotide identity blast of 92.64±3.8% and an DDH of 49.9% (range: 47.3-52.5%), differing from the latter by its ability to ferment l-arabinose and its inability to ferment l-rhamnose, d-galactose, d-lactose and d-melibiose. The names sp. nov. and subsp. subsp. nov. are proposed for taxon I and II, respectively, with type strains CLIP 2022/01175 (F6L-1A=CIP 112444 = DSM 117029) and CLIP 2022/01000 (F66L-1A=CIP 112443 = DSM 117030), respectively. Both taxa lack known pathogenic islands, suggesting a lack of pathogenicity for humans.
2018年9月,飓风“佛罗伦萨”导致美国北卡罗来纳州发生严重洪灾。从飓风“佛罗伦萨”洪水样本中分离 及其他 物种的工作反复得到了非溶血 样分离株,这些分离株难以轻易归类到已知分类单元。与目前已知的28种 物种进行全基因组序列分析后证实,这些分离株构成了 属内的两个新分类单元。分类单元I有一个分离株,与 相似度最高,平均核苷酸同一性比对为85.3±4.4%,DNA-DNA杂交(DDH)为32.4%(范围:30 - 35%),与后者的不同之处在于其具有还原硝酸盐、发酵d-核糖和蔗糖的能力,以及不产生过氧化氢酶、不发酵d-海藻糖和d-乳糖的特性。分类单元II有11个分离株,与 相似度最高,平均核苷酸同一性比对为92.64±3.8%,DDH为49.9%(范围:47.3 - 52.5%),与后者的不同之处在于其具有发酵l-阿拉伯糖的能力,以及不发酵l-鼠李糖、d-半乳糖、d-乳糖和d-蜜二糖的特性。分别为分类单元I和II提议了新物种名称 新种和 新亚种,模式菌株分别为CLIP 2022/01175(F6L - 1A = CIP 112444 = DSM 117029)和CLIP 2022/01000(F66L - 1A = CIP 112443 = DSM 117030)。这两个分类单元均缺乏已知的 致病岛,表明它们对人类无致病性。