World's Best Scientists 2026 revealed!

D-Index & Metrics

Biology and Biochemistry

D-Index
43
Citations
7122
World Ranking
19400
National Ranking
1399

Overview

What is he best known for?

The fields of study he is best known for:

  • Gene
  • DNA
  • Virus

His main research concerns Virology, Sapovirus, Norovirus, Genotype and Capsid. His Virology research incorporates elements of Phylogenetics and Microbiology. His Phylogenetics study which covers Genome that intersects with Recombinant DNA.

His study in Norovirus is interdisciplinary in nature, drawing from both Molecular epidemiology and Rotavirus. His research in Genotype is mostly concerned with Genotyping. The study incorporates disciplines such as Molecular typing, Pathogen, Mink and Disease in addition to Outbreak.

His most cited work include:

  • Coexistence of Multiple Genotypes, Including Newly Identified Genotypes, in Outbreaks of Gastroenteritis Due to Norovirus in Japan (371 citations)
  • Phylogenetic analysis of the complete genome of 18 Norwalk-like viruses. (279 citations)
  • Detection of human sapovirus by real-time reverse transcription-polymerase chain reaction (194 citations)

What are the main themes of his work throughout his whole career to date?

His primary scientific interests are in Virology, Sapovirus, Genotype, Norovirus and Genetics. Tomoichiro Oka combines subjects such as Recombinant DNA and Microbiology with his study of Virology. His Sapovirus research includes themes of Pathogen, Feces, Viral replication, Caliciviridae Infections and Sequence analysis.

His biological study spans a wide range of topics, including Phylogenetics and Whole genome sequencing. Tomoichiro Oka focuses mostly in the field of Norovirus, narrowing it down to topics relating to Molecular epidemiology and, in certain cases, Caliciviridae. His research investigates the connection between Capsid and topics such as Molecular biology that intersect with problems in Reverse transcription polymerase chain reaction.

He most often published in these fields:

  • Virology (78.72%)
  • Sapovirus (54.61%)
  • Genotype (34.04%)

What were the highlights of his more recent work (between 2015-2021)?

  • Virology (78.72%)
  • Sapovirus (54.61%)
  • Genome (21.28%)

In recent papers he was focusing on the following fields of study:

His primary areas of study are Virology, Sapovirus, Genome, Genetics and Phylogenetic tree. His Virology research integrates issues from Strain, Recombination and Pathogenesis. Genotype and Norovirus are inextricably linked to his Sapovirus research.

His Genotype study combines topics in areas such as Reverse transcription polymerase chain reaction, Cysteine protease, Outbreak, Complementary DNA and Primer. His work deals with themes such as Feces and Sequence analysis, which intersect with Genome. Tomoichiro Oka interconnects Wild boar, Phylogenetics, Virus and Metagenomics in the investigation of issues within Phylogenetic tree.

Between 2015 and 2021, his most popular works were:

  • Genetic Characterization and Classification of Human and Animal Sapoviruses. (42 citations)
  • Genetic Characterization and Classification of Human and Animal Sapoviruses. (42 citations)
  • Attempts to grow human noroviruses, a sapovirus, and a bovine norovirus in vitro. (26 citations)

In his most recent research, the most cited papers focused on:

  • Gene
  • DNA
  • Virus

The scientist’s investigation covers issues in Sapovirus, Virology, Genetics, Genome and Polymerase chain reaction. His Sapovirus study improves the overall literature in Genotype. He has researched Genotype in several fields, including GenBank, Outbreak and Capsid.

Norovirus and Viral replication are the primary areas of interest in his Virology study. His Polymerase chain reaction research incorporates themes from Amino acid, Sequence analysis, NS3, Mink and Protein sequencing. The various areas that he examines in his Coding region study include Peptide sequence, Strain, Genetic diversity and Phylogenetics.

Best Publications

  • Coexistence of Multiple Genotypes, Including Newly Identified Genotypes, in Outbreaks of Gastroenteritis Due to Norovirus in Japan

    Tsutomu Kageyama;Michiyo Shinohara;Kazue Uchida;Shuetsu Fukushi

  • Phylogenetic analysis of the complete genome of 18 Norwalk-like viruses.

    Kazuhiko Katayama;Haruko Shirato-Horikoshi;Shigeyuki Kojima;Tsutomu Kageyama

  • Comprehensive Review of Human Sapoviruses

    Tomoichiro Oka;Tomoichiro Oka;Qiuhong Wang;Kazuhiko Katayama;Linda J. Saif

  • Detection of human sapovirus by real-time reverse transcription-polymerase chain reaction

    Tomoichiro Oka;Kazuhiko Katayama;Grant S. Hansman;Tsutomu Kageyama

  • Norovirus Infections in Symptomatic and Asymptomatic Food Handlers in Japan

    Kazuhiro Ozawa;Tomoichiro Oka;Naokazu Takeda;Grant S. Hansman

  • Cell culture isolation and sequence analysis of genetically diverse US porcine epidemic diarrhea virus strains including a novel strain with a large deletion in the spike gene.

    Tomoichiro Oka;Linda J. Saif;Douglas Marthaler;Malak A. Esseili

  • Genetic and antigenic diversity among noroviruses.

    Grant S. Hansman;Katsuro Natori;Haruko Shirato-Horikoshi;Satoko Ogawa

  • Human sapoviruses: genetic diversity, recombination, and classification

    Grant S. Hansman;Tomoichiro Oka;Kazuhiko Katayama;Naokazu Takeda

  • Distribution of phospholipid transfer protein in human plasma: presence of two forms of phospholipid transfer protein, one catalytically active and the other inactive.

    Tomoichiro Oka;Takeshi Kujiraoka;Mayumi Ito;Tohru Egashira

  • Antigenic Relationships among Porcine Epidemic Diarrhea Virus and Transmissible Gastroenteritis Virus Strains

    Chun-Ming Lin;Xiang Gao;Tomoichiro Oka;Anastasia N Vlasova

  • Isolation and partial characterization of the inactive and active forms of human plasma phospholipid transfer protein (PLTP).

    Minna Kärkkäinen;Tomoichiro Oka;Vesa M. Olkkonen;Jari Metso

  • Human sapovirus classification based on complete capsid nucleotide sequences

    Tomoichiro Oka;Tomoichiro Oka;Kohji Mori;Nobuhiro Iritani;Seiya Harada

  • Divergent Evolution of Norovirus GII/4 by Genome Recombination from May 2006 to February 2009 in Japan

    Kazushi Motomura;Masaru Yokoyama;Hirotaka Ode;Hiromi Nakamura

  • Identification of Monomorphic and Divergent Haplotypes in the 2006-2007 Norovirus GII/4 Epidemic Population by Genomewide Tracing of Evolutionary History

    Kazushi Motomura;Tomoichiro Oka;Masaru Yokoyama;Hiromi Nakamura

  • Intergenogroup recombination in sapoviruses.

    Grant S. Hansman;Naokazu Takeda;Tomoichiro Oka;Mitsukai Oseto

  • Prevalence of Porcine Noroviruses, Molecular Characterization of Emerging Porcine Sapoviruses from Finisher Swine in the United States, and Unified Classification Scheme for Sapoviruses

    Kelly A. Scheuer;Tomoichiro Oka;Armando E. Hoet;Wondwossen A. Gebreyes

  • Outbreak of Gastroenteritis Due to Sapovirus

    Grant S. Hansman;Hiroyuki Saito;Chihiro Shibata;Shizuko Ishizuka

  • Two novel missense mutations in the CETP gene in Japanese hyperalphalipoproteinemic subjects: high-throughput assay by Invader assay.

    Makoto Nagano;Shizuya Yamashita;Ken-ichi Hirano;Mayumi Ito

  • A sandwich enzyme-linked immunosorbent assay for human serum paraoxonase concentration.

    Takeshi Kujiraoka;Tomoichiro Oka;Mitsuaki Ishihara;Tohru Egashira

  • Novel recombinant sapovirus.

    Kazuhiko Katayama;Tatsuya Miyoshi;Kiyoko Uchino;Tomoichiro Oka

Frequent Co-Authors

Kazuhiko Katayama
Kazuhiko Katayama Kitasato University
Naokazu Takeda
Naokazu Takeda National Institutes of Health
Grant S. Hansman
Grant S. Hansman Griffith University
Takaji Wakita
Takaji Wakita National Institute of Infectious Diseases
Tetsuya Mizutani
Tetsuya Mizutani Tokyo University of Agriculture and Technology
Hirokazu Kimura
Hirokazu Kimura RMIT University
Tatsuo Miyamura
Tatsuo Miyamura National Institutes of Health
Vesa M. Olkkonen
Vesa M. Olkkonen University of Helsinki
Kwonil Jung
Kwonil Jung The Ohio State University
Tetsuya Hosaka
Tetsuya Hosaka Toranomon Hospital

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