World's Best Scientists 2026 revealed!
Award Badge
Medicine
Japan
2023

D-Index & Metrics

Immunology

D-Index
120
Citations
54956
World Ranking
329
National Ranking
14

Medicine

D-Index
120
Citations
55797
World Ranking
3735
National Ranking
73

Research.com Recognitions

  • 2023 - Research.com Medicine in Japan Leader Award

Overview

Hiroaki Okamoto is affiliated with Jichi Medical University in Japan and has contributed extensively to the field of medicine, with a primary focus on hepatology. Their research spans several subfields including hepatology, cardiology and cardiovascular medicine, infectious diseases, epidemiology, and pulmonary and respiratory medicine.

The scientist's work covers a variety of key topics within medical research such as hepatitis viruses studies and epidemiology, viral gastroenteritis research and epidemiology, liver disease and transplantation, hepatitis C virus research, hepatitis B virus studies, liver disease diagnosis and treatment, and sepsis diagnosis and treatment.

Frequent publication venues for Hiroaki Okamoto include the following journals:

  • Viruses
  • Virus Research
  • Clinical Journal of Gastroenterology
  • Kanzo
  • Hepatology Research

Some recent papers featuring their work are:

  • "Update: proposed reference sequences for subtypes of hepatitis E virus (species Orthohepevirus A)," 2020, Journal of General Virology
  • "ICTV Virus Taxonomy Profile: Hepeviridae 2022," 2022, Journal of General Virology
  • "Taxonomic update for mammalian anelloviruses (family Anelloviridae)," 2021, Archives of Virology
  • "Features and Outcomes of Histologically Proven Myocarditis With Fulminant Presentation," 2022, Circulation
  • "Outcomes of Venoarterial Extracorporeal Membrane Oxygenation Plus Intra-Aortic Balloon Pumping for Treatment of Acute Myocardial Infarction Complicated by Cardiogenic Shock," 2022, Journal of the American Heart Association

Hiroaki Okamoto has collaborated frequently with a group of researchers including Masaharu Takahashi, Shigeo Nagashima, Kazumoto Murata, Putu Prathiwi Primadharsini, and Tatsuo Kanda. These collaborations have contributed to a significant body of work in their respective fields.

Best Publications

  • Consensus proposals for a unified system of nomenclature of hepatitis C virus genotypes.

    Peter Simmonds;Jens Bukh;Christophe Combet;Gilbert Deléage

  • A novel DNA virus (TTV) associated with elevated transaminase levels in posttransfusion hepatitis of unknown etiology.

    Tsutomu Nishizawa;Hiroaki Okamoto;Keiko Konishi;Hiroshi Yoshizawa

  • Typing Hepatitis B Virus by Homology in Nucleotide Sequence: Comparison of Surface Antigen Subtypes

    Hiroaki Okamoto;Fumio Tsuda;Hiroshi Sakugawa;Retno I. Sastrosoewignjo

  • Typing hepatitis C virus by polymerase chain reaction with type-specific primers: application to clinical surveys and tracing infectious sources.

    Hiroaki Okamoto;Yasushi Sugiyama;Shunichi Okada;Kiyohiko Kurai

  • Molecular cloning and characterization of a novel DNA virus (TTV) associated with posttransfusion hepatitis of unknown etiology

    Hiroaki Okamoto;Tsutomu Nishizawa;Naomi Kato;Masato Ukita

  • Full-length sequence of a hepatitis C virus genome having poor homology to reported isolates: comparative study of four distinct genotypes.

    Hiroaki Okamoto;Kiyohiko Kurai;Shun-Ichi Okada;Kayoko Yamamoto

  • Sporadic acute or fulminant hepatitis E in Hokkaido, Japan, may be food-borne, as suggested by the presence of hepatitis E virus in pig liver as food

    Yasuyuki Yazaki;Hitoshi Mizuo;Masaharu Takahashi;Tsutomu Nishizawa

  • Detection of hepatitis C virus RNA by a two-stage polymerase chain reaction with two pairs of primers deduced from the 5'-noncoding region.

    H Okamoto;S Okada;Y Sugiyama;T Tanaka

  • Consensus proposals for classification of the family Hepeviridae

    Donald B. Smith;Peter Simmonds;Shahid Jameel

  • Hepatitis B virus with mutations in the core promoter for an e antigen-negative phenotype in carriers with antibody to e antigen.

    H Okamoto;F Tsuda;Y Akahane;Y Sugai

  • The 5'-terminal sequence of the hepatitis C virus genome.

    Okamoto H;Okada S;Sugiyama Y;Yotsumoto S

  • Detection of the GBV-C hepatitis virus genome in serum from patients with fulminant hepatitis of unknown aetiology.

    M. Yoshiba;H. Okamoto;S. Mishiro

  • Hepatitis B viruses with precore region defects prevail in persistently infected hosts along with seroconversion to the antibody against e antigen.

    H Okamoto;S Yotsumoto;Y Akahane;T Yamanaka

  • Characterization of the genomic sequence of type V (or 3a) hepatitis C virus isolates and PCR primers for specific detection

    Hiroaki Okamoto;Hajime Tokita;Minoru Sakamoto;Minoru Horikita

  • Nucleotide sequence of the genomic RNA of hepatitis C virus isolated from a human carrier: comparison with reported isolates for conserved and divergent regions.

    Hiroaki Okamoto;Shunichi Okada;Yasushi Sugiyama;Kiyohiko Kurai

  • Hepatitis C virus infection in medical personnel after needlestick accident

    Takehiro Mitsui;Keiko Iwano;Kazuo Masuko;Chikao Yamazaki

  • Infection with Hepatitis GB Virus C in Patients on Maintenance Hemodialysis

    Kazuo Masuko;Takehiro Mitsui;Keiko Iwano;Chikao Yamazaki

  • Genetic drift of hepatitis C virus during an 8.2-year infection in a chimpanzee: Variability and stability

    Hiroaki Okamoto;Maki Kojima;Shun-Ichi Okada;Hiroshi Yoshizawa

  • Fecal excretion of a nonenveloped DNA virus (TTV) associated with posttransfusion non-A-G hepatitis

    Hiroaki Okamoto;Yoshihiro Akahane;Masato Ukita;Masako Fukuda

  • Hepatitis B virus strains with mutations in the core promoter in patients with fulminant hepatitis.

    Shunichi Sato;Kazuyuki Suzuki;Yoshihiro Akahane;Koichi Akamatsu

  • Transmission of Hepatitis C Virus From Mothers to Infants

    Hitoshi Ohto;Sousuke Terazawa;Nobuhiko Sasaki;Nobutaka Sasaki

Frequent Co-Authors

Masaharu Takahashi
Masaharu Takahashi Chiba University
Fumio Tsuda
Fumio Tsuda Toshiba (Japan)
Makoto Mayumi
Makoto Mayumi Jichi Medical University
Takeshi Tanaka
Takeshi Tanaka Texas Medical Center
Yuzo Miyakawa
Yuzo Miyakawa Miyakawa Memorial Research Foundation
Yuichiro Ohe
Yuichiro Ohe National Cancer Centre
Tomohide Tamura
Tomohide Tamura St. Luke's International Hospital
Kazuhiko Nakagawa
Kazuhiko Nakagawa Kindai University
Shunji Mishiro
Shunji Mishiro Toshiba (Japan)
Isamu Okamoto
Isamu Okamoto Kyushu University

If you think any of the details on this page are incorrect, let us know.

Report an issue

We appreciate your kind effort to assist us to improve this page, it would be helpful providing us with as much detail as possible in the text box below:

Related Online Degrees & Career Pathways

Exploring Immunology in the USA opens doors to various specialized healthcare careers, many of which can be pursued through flexible online programs. For example, nurses interested in advancing their expertise might consider transitioning to more acute care roles. Programs like the fnp to acute care np bridge program provide a streamlined path to becoming an Acute Care Nurse Practitioner, expanding clinical skills and career opportunities.

Those aiming to accelerate their journey into advanced nursing roles can explore options such as the accelerated fnp programs. These are designed to fast-track education, allowing students to enter the workforce sooner while gaining valuable credentials.

For individuals without a nursing background, many institutions offer online nursing programs for non nurses. These programs create accessible pathways for career changers eager to enter nursing and related health fields, including immunology-focused specialties.

Additionally, the easiest absn programs to get into provide entry points for students seeking a Bachelor of Science in Nursing through accelerated study formats. These programs balance quality education with manageable admissions requirements, helping aspiring nursing professionals start their careers.

Best Scientists Citing Hiroaki Okamoto

Trending Scientists

Recently Published Articles