World's Best Scientists 2026 revealed!
Keiichi Hiramatsu

Keiichi Hiramatsu

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Microbiology
Japan
2023

D-Index & Metrics

Microbiology

D-Index
96
Citations
46042
World Ranking
492
National Ranking
13

Medicine

D-Index
96
Citations
46085
World Ranking
9509
National Ranking
260

Keiichi Hiramatsu publication distribution in Microbiology in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Microbiology in 2026. The highlighted bar marks where Keiichi Hiramatsu sits on this spectrum.

55–64 publications: 8 scientists 65–74 publications: 29 scientists 75–84 publications: 55 scientists 85–94 publications: 112 scientists 95–104 publications: 137 scientists 105–114 publications: 190 scientists 115–124 publications: 235 scientists 125–134 publications: 234 scientists 135–144 publications: 288 scientists 145–154 publications: 264 scientists 155–164 publications: 264 scientists 165–174 publications: 253 scientists 175–184 publications: 276 scientists 185–194 publications: 190 scientists 195–204 publications: 233 scientists 205–214 publications: 207 scientists 215–224 publications: 198 scientists 225–234 publications: 155 scientists 235–244 publications: 161 scientists 245–254 publications: 160 scientists 255–264 publications: 146 scientists 265–274 publications: 139 scientists 275–284 publications: 148 scientists 285–294 publications: 115 scientists 295–304 publications: 96 scientists 305–314 publications: 88 scientists 315–324 publications: 106 scientists 325–334 publications: 65 scientists 335–344 publications: 76 scientists 345–354 publications: 64 scientists 355–364 publications: 62 scientists 365–374 publications: 65 scientists 375–384 publications: 61 scientists 385–394 publications: 34 scientists 395–404 publications: 44 scientists 405–414 publications: 36 scientists 415–424 publications: 35 scientists 425–434 publications: 29 scientists 435–444 publications: 33 scientists 445–454 publications: 34 scientists 455–464 publications: 25 scientists 465–474 publications: 26 scientists 475–484 publications: 20 scientists 485–494 publications: 19 scientists 495–504 publications: 16 scientists 505–514 publications: 17 scientists 515–524 publications: 23 scientists 525–534 publications: 14 scientists 535–544 publications: 14 scientists 545–554 publications: 18 scientists 555–564 publications: 12 scientists 565–574 publications: 7 scientists 575–584 publications: 9 scientists 585–594 publications: 9 scientists 595–604 publications: 9 scientists 605–614 publications: 7 scientists 615–624 publications: 9 scientists 625–634 publications: 7 scientists 635–644 publications: 4 scientists 645–654 publications: 5 scientists 655–664 publications: 6 scientists 665–674 publications: 7 scientists 675–678 publications: 3 scientists 679+ publications: 99 scientists
55 publications 679+

This scientist: 354 publications — 85th percentile

85% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 679 publications or more.

Keiichi Hiramatsu D-index placement in Microbiology in 2026

The chart shows the D-index (discipline H-index) distribution of Microbiology scientists ranked by Research.com in 2026. The highlighted bar marks where Keiichi Hiramatsu sits on this spectrum.

40 D-Index: 30 scientists 41 D-Index: 86 scientists 42 D-Index: 90 scientists 43 D-Index: 117 scientists 44 D-Index: 122 scientists 45 D-Index: 123 scientists 46 D-Index: 108 scientists 47 D-Index: 110 scientists 48 D-Index: 106 scientists 49 D-Index: 109 scientists 50 D-Index: 129 scientists 51 D-Index: 111 scientists 52 D-Index: 116 scientists 53 D-Index: 127 scientists 54 D-Index: 134 scientists 55 D-Index: 134 scientists 56 D-Index: 111 scientists 57 D-Index: 136 scientists 58 D-Index: 162 scientists 59 D-Index: 151 scientists 60 D-Index: 139 scientists 61 D-Index: 122 scientists 62 D-Index: 126 scientists 63 D-Index: 144 scientists 64 D-Index: 109 scientists 65 D-Index: 103 scientists 66 D-Index: 124 scientists 67 D-Index: 112 scientists 68 D-Index: 103 scientists 69 D-Index: 131 scientists 70 D-Index: 93 scientists 71 D-Index: 93 scientists 72 D-Index: 96 scientists 73 D-Index: 92 scientists 74 D-Index: 80 scientists 75 D-Index: 66 scientists 76 D-Index: 87 scientists 77 D-Index: 60 scientists 78 D-Index: 73 scientists 79 D-Index: 59 scientists 80 D-Index: 57 scientists 81 D-Index: 55 scientists 82 D-Index: 47 scientists 83 D-Index: 77 scientists 84 D-Index: 50 scientists 85 D-Index: 45 scientists 86 D-Index: 42 scientists 87 D-Index: 41 scientists 88 D-Index: 32 scientists 89 D-Index: 38 scientists 90 D-Index: 35 scientists 91 D-Index: 34 scientists 92 D-Index: 27 scientists 93 D-Index: 26 scientists 94 D-Index: 33 scientists 95 D-Index: 22 scientists 96 D-Index: 37 scientists 97 D-Index: 22 scientists 98 D-Index: 21 scientists 99 D-Index: 22 scientists 100 D-Index: 30 scientists 101 D-Index: 16 scientists 102 D-Index: 20 scientists 103 D-Index: 17 scientists 104 D-Index: 19 scientists 105 D-Index: 16 scientists 106 D-Index: 19 scientists 107 D-Index: 18 scientists 108 D-Index: 14 scientists 109 D-Index: 10 scientists 110 D-Index: 9 scientists 111 D-Index: 7 scientists 112 D-Index: 11 scientists 113 D-Index: 6 scientists 114 D-Index: 15 scientists 115 D-Index: 10 scientists 116 D-Index: 12 scientists 117 D-Index: 7 scientists 118 D-Index: 10 scientists 119 D-Index: 10 scientists 120 D-Index: 11 scientists 121 D-Index: 2 scientists 122 D-Index: 7 scientists 123 D-Index: 12 scientists 124 D-Index: 5 scientists 125 D-Index: 9 scientists 126 D-Index: 6 scientists 127+ D-Index: 95 scientists
40 D-Index 127+

This scientist: 96 D-Index — 91st percentile

91% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 127 D-Index or more.

Research.com Recognitions

  • 2023 - Research.com Microbiology in Japan Leader Award
  • 2022 - Research.com Microbiology in Japan Leader Award

Overview

Keiichi Hiramatsu is affiliated with Juntendo University in Japan and has contributed extensively to research in biochemistry, genetics, molecular biology, and medicine. Their work spans multiple subfields including molecular biology, infectious diseases, plant science, clinical biochemistry, and ecology.

The scientist has a particular focus on antimicrobial resistance in Staphylococcus species, bacterial identification and susceptibility testing, and studies on plant pathogenic bacteria. Their research also covers bacterial biofilms and quorum sensing, genomics and phylogenetic studies, as well as investigations into Clostridium difficile and Clostridium perfringens. Additionally, they have explored microbial community ecology and physiology.

Recent publications authored by Keiichi Hiramatsu include the following:

  • "A Soluble Fiber Diet Increases Bacteroides fragilis Group Abundance and Immunoglobulin A Production in the Gut," 2020, Applied and Environmental Microbiology
  • "Genetic and phenotypic diversity of methicillin-resistant Staphylococcus aureus among Japanese inpatients in the early 1980s," 2021, Scientific Reports
  • "CID12261165, a flavonoid compound as antibacterial agents against quinolone-resistant Staphylococcus aureus," 2023, Scientific Reports
  • "Epidemiology of methicillin-resistant Staphylococcus aureus in a Japanese neonatal intensive care unit," 2020, Pediatrics International
  • "Pseudomonas atagosis sp. nov., and Pseudomonas akappagea sp. nov., New Soil Bacteria Isolated from Samples on the Volcanic Island Izu Oshima, Tokyo," 2020, Current Microbiology

Keiichi Hiramatsu frequently publishes in journals such as Scientific Reports, Current Microbiology, Applied and Environmental Microbiology, Pediatrics International, and the Japanese Journal of Infectious Diseases. The scientist collaborates regularly with coauthors including Yuh Morimoto, Tadashi Baba, Teruo Kirikae, Yuki Uehara, and Takashi Sasaki, with multiple joint publications.

Best Publications

  • Methicillin-resistant Staphylococcus aureus clinical strain with reduced vancomycin susceptibility.

    K Hiramatsu;H Hanaki;T Ino;K Yabuta

  • Whole genome sequencing of meticillin-resistant Staphylococcus aureus

    Makoto Kuroda;Toshiko Ohta;Ikuo Uchiyama;Tadashi Baba

  • Genome and virulence determinants of high virulence community-acquired MRSA.

    Tadashi Baba;Fumihiko Takeuchi;Makoto Kuroda;Harumi Yuzawa

  • Dissemination in Japanese hospitals of strains of Staphylococcus aureus heterogeneously resistant to vancomycin

    Keiichi Hiramatsu;Nanae Aritaka;Hideaki Hanaki;Shiori Kawasaki

  • A New Class of Genetic Element, Staphylococcus Cassette Chromosome mec, Encodes Methicillin Resistance in Staphylococcus aureus

    Y. Katayama;T. Ito;K. Hiramatsu

  • Structural comparison of three types of staphylococcal cassette chromosome mec integrated in the chromosome in methicillin-resistant Staphylococcus aureus.

    Teruyo Ito;Yuki Katayama;Kazumi Asada;Namiko Mori

  • Combination of multiplex PCRs for staphylococcal cassette chromosome mec type assignment: rapid identification system for mec, ccr, and major differences in junkyard regions.

    Yoko Kondo;Teruyo Ito;Xiao Xue Ma;Shinya Watanabe

  • The emergence and evolution of methicillin-resistant Staphylococcus aureus.

    Keiichi Hiramatsu;Longzhu Cui;Makoto Kuroda;Teruyo Ito

  • Dissemination of New Methicillin-Resistant Staphylococcus aureus Clones in the Community

    Keiko Okuma;Kozue Iwakawa;John D. Turnidge;Warren B. Grubb

  • Vancomycin-resistant Staphylococcus aureus: a new model of antibiotic resistance

    Keiichi Hiramatsu

  • Novel Type V Staphylococcal Cassette Chromosome mec Driven by a Novel Cassette Chromosome Recombinase, ccrC

    Teruyo Ito;Xiao Xue Ma;Fumihiko Takeuchi;Keiko Okuma

  • Novel Type of Staphylococcal Cassette Chromosome mec Identified in Community-Acquired Methicillin-Resistant Staphylococcus aureus Strains

    Xiao Xue Ma;Teruyo Ito;Chuntima Tiensasitorn;Mantana Jamklang

  • Classification of staphylococcal cassette chromosome mec (SCCmec) : guidelines for reporting novel SCCmec elements.

    T. Ito;K. Hiramatsu;D. Oliviera;H. de Lencastre

  • Cell Wall Thickening Is a Common Feature of Vancomycin Resistance in Staphylococcus aureus

    Longzhu Cui;Xiaoxue Ma;Katsuhiro Sato;Keiko Okuma

  • Cloning and Nucleotide Sequence Determination of the Entire mec DNA of Pre-Methicillin-Resistant Staphylococcus aureus N315

    T. Ito;Y. Katayama;K. Hiramatsu

  • Genome Sequence of Staphylococcus aureus Strain Newman and Comparative Analysis of Staphylococcal Genomes: Polymorphism and Evolution of Two Major Pathogenicity Islands

    Tadashi Baba;Taeok Bae;Olaf Schneewind;Fumihiko Takeuchi

  • Characterization of Staphylococci with Reduced Susceptibilities to Vancomycin and Other Glycopeptides

    Fred C. Tenover;Michael V. Lancaster;Bertha C. Hill;Christine D. Steward

  • Insights on antibiotic resistance of Staphylococcus aureus from its whole genome: genomic island SCC

    Teruyo Ito;Keiko Okuma;Xiao Xue Ma;Harumi Yuzawa

  • Two-component system VraSR positively modulates the regulation of cell-wall biosynthesis pathway in Staphylococcus aureus.

    Makoto Kuroda;Hiroko Kuroda;Taku Oshima;Fumihiko Takeuchi

  • Staphylococcal cassette chromosome mec (SCCmec) typing of methicillin-resistant Staphylococcus aureus strains isolated in 11 Asian countries : a proposal for a new nomenclature for SCCmec elements

    Piriyaporn Chongtrakool;Piriyaporn Chongtrakool;Teruyo Ito;Xiao Xue Ma;Yoko Kondo

Frequent Co-Authors

Teruyo Ito
Teruyo Ito Juntendo University
Fumihiko Takeuchi
Fumihiko Takeuchi Juntendo University
Makoto Kuroda
Makoto Kuroda National Institutes of Health
Kazuhisa Sekimizu
Kazuhisa Sekimizu University of Tokyo
Teruo Kirikae
Teruo Kirikae Juntendo University
Fred C. Tenover
Fred C. Tenover University of Dayton
Ko Okumura
Ko Okumura Juntendo University
Susan Boyle-Vavra
Susan Boyle-Vavra University of Chicago
Isao Nagaoka
Isao Nagaoka Juntendo University
Robert S. Daum
Robert S. Daum University of Chicago

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