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<p>Giardiasis is a parasitic intestinal infection of both animals and humans, caused by the enteric protozoan <i>Giardia duodenalis</i> (syn. <i>G. lamblia</i> and <i>G. intestinalis</i>). To date, symbiont RNA viruses of <i>G. duodenalis</i>: <i>Giardia lamblia</i> virus (GLV) and <i>Giardia duodenalis</i> RNA virus-2 (GdRV-2) have been reported. Here, we report the complete genome sequence of a novel virus identified in a human isolate of <i>G. duodenalis</i> using fragmented and primer-ligated double-stranded RNA sequencing. This virus, designated the Non-GLV <i>Giardia duodenalis</i> ISE strain (Noggi) virus, is genetically distinct from GLV and GdRV-2 and likely represents the third symbiont virus in <i>Giardia</i> parasites.</p>

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Identification of a novel toti-like virus symbiotic with Giardia duodenalis

  • 期刊论文

  • 发表日期：

    2026年3月24日

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  • Shintaro Shichinohe,
  • Shinji Izumiyama,
  • Yoshihiro Takaki,
  • Miho Hirai,
  • Syun-ichi Urayama,
  • Takuro Nunoura,
  • Makoto Kazama

摘要

Giardiasis is a parasitic intestinal infection of both animals and humans, caused by the enteric protozoan Giardia duodenalis (syn. G. lamblia and G. intestinalis). To date, symbiont RNA viruses of G. duodenalis: Giardia lamblia virus (GLV) and Giardia duodenalis RNA virus-2 (GdRV-2) have been reported. Here, we report the complete genome sequence of a novel virus identified in a human isolate of G. duodenalis using fragmented and primer-ligated double-stranded RNA sequencing. This virus, designated the Non-GLV Giardia duodenalis ISE strain (Noggi) virus, is genetically distinct from GLV and GdRV-2 and likely represents the third symbiont virus in Giardia parasites.