Volume 51, Issue 9 pp. 815-822
Article
Free Access

Detection and Phylogenetic Analysis of Norovirus in Corbicula fluminea in a Freshwater River in Japan

Mika Saitoh

Mika Saitoh

Gunma Prefectural Institute of Public Health and Environmental Sciences, Maebashi, Gunma, 371-0052 Japan

Department of Biological Sciences, Faculty of Engineering, Gunma University, Kiryu, Gunma, 376-8515 Japan

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Hirokazu Kimura

Hirokazu Kimura

Gunma Prefectural Institute of Public Health and Environmental Sciences, Maebashi, Gunma, 371-0052 Japan

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Kunihisa Kozawa

Kunihisa Kozawa

Gunma Prefectural Institute of Public Health and Environmental Sciences, Maebashi, Gunma, 371-0052 Japan

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Osamu Nishio

Osamu Nishio

National Institute of Infectious Diseases, Musashimurayama, Tokyo, 208-0011 Japan

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Akira Shoji

Corresponding Author

Akira Shoji

Department of Biological Sciences, Faculty of Engineering, Gunma University, Kiryu, Gunma, 376-8515 Japan

Address correspondence to Dr. Akira Shoji, Department of Biological Sciences, Faculty of Engineering, Gunma University, 1-5-1 Tenjincho, Kiryu, Gunma 376-8515, Japan. Fax: + 81-277-30-1443. E-mail: [email protected]Search for more papers by this author
First published: 14 November 2013
Citations: 14

Abstract

To study the molecular epidemiology of noroviruses (NoVs) in bivalves residing in freshwater rivers, we detected, quantified and phylogenetically analyzed the NoV genome in purified concentrates obtained from the gills and digestive diverticula of Corbicula fluminea in a freshwater river in Gunma Prefecture, Japan. We detected the NoV genome in 35 of the 58 C. fluminea samples. Based on our phylogenetic analysis, the NoV genome detected in the samples was classified into 4 genotypes (GI/1, GI/2, GI/3 and GI/4) in genogroup I and 5 genotypes (GII/3, GII/4, GII/5, GII/8 and GII/12) in genogroup II. The phylogenetic tree showed wide genetic diversity among the genogroups. In addition, more than 104 copies of the NoV genome were detected in 2 of 35 samples. These results suggest that the freshwater bivalve C. fluminea is a reservoir for NoVs, similar to seawater bivalves such as oysters.

Abbreviations

  • GI
  • genogroup I
  • GII
  • genogroup II
  • N-J
  • neighbor-joining
  • NoV
  • norovirus
  • OTU
  • operational taxonomic unit
  • PBS
  • phosphate-buffered saline
  • PCR
  • polymerase chain reaction
  • RT-PCR
  • reverse transcription-PCR.
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