World's Best Scientists 2026 revealed!
Katsuya Hirai

Katsuya Hirai

D-Index & Metrics

Microbiology

D-Index
48
Citations
5854
World Ranking
4724
National Ranking
192

Katsuya Hirai 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 Katsuya Hirai 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: 156 publications — 29th percentile

29% of scientists in this discipline score the same or lower.

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

Katsuya Hirai 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 Katsuya Hirai 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: 48 D-Index — 16th percentile

16% of scientists in this discipline score the same or lower.

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

Overview

Katsuya Hirai is affiliated with Gifu University in Japan. The available data does not include recent papers, co-authors, publication venues, or book publications linked to this researcher.

No specific fields of study, subfields, or main topics of research have been documented. Likewise, there are no recorded awards or honors connected to this individual.

Due to the limited amount of publicly available information, further details on scientific contributions, research focus, or scholarly impact are not accessible at this time.

Best Publications

  • Proposal of Chlamydia pecorum sp. nov. for Chlamydia strains derived from ruminants.

    Hideto Fukushi;Katsuya Hirai

  • Identification of sequence changes responsible for the attenuation of highly virulent infectious bursal disease virus.

    Tsuyoshi Yamaguchi;Motohiko Ogawa;Yasuo Inoshima;Masahiro Miyoshi

  • Clinical Evaluation of a New PCR Assay for Detection of Coxiella burnetii in Human Serum Samples

    G. Q. Zhang;Sa V. Nguyen;H. To;M. Ogawa

  • Isolation of Coxiella burnetii from dairy cattle and ticks, and some characteristics of the isolates in Japan.

    To Ho;Khin Khin Htwe;Naomi Yamasaki;Guo Quan Zhang

  • Sequence and phylogenetic analyses of highly virulent infectious bursal disease virus

    T. Yamaguchi;M. Ogawa;M. Miyoshi;Y. Inoshima

  • Coxiella burnetii Isolates Cause Genogroup-Specific Virulence in Mouse and Guinea Pig Models of Acute Q Fever

    K. E Russell-Lodrigue;K. E Russell-Lodrigue;M Andoh;M. W. J Poels;H. R Shive

  • The immunodepressive effect of infectious bursal disease virus in chickens.

    K Hirai;S Shimakura;E Kawamoto;F Taguchi

  • An etiological investigation of domestic cats with conjunctivitis and upper respiratory tract disease in Japan.

    Yan Cai;Hideto Fukushi;Saori Koyasu;Etsuko Kuroda

  • Gazelle Herpesvirus 1: A New Neurotropic Herpesvirus Immunologically Related to Equine Herpesvirus 1

    Hideto Fukushi;Takako Tomita;Akiko Taniguchi;Yoshitsugu Ochiai

  • Genetic diversity of avian and mammalian Chlamydia psittaci strains and relation to host origin.

    H Fukushi;K Hirai

  • Comparison of Ehrlichia muris Strains Isolated from Wild Mice and Ticks and Serologic Survey of Humans and Animals with E. muris as Antigen

    Makoto Kawahara;Tadahiko Ito;Chiharu Suto;Shinichiro Shibata

  • Organochlorine pesticides and polychlorinated biphenyl congeners in wild terrestrial mammals and birds from Chubu region, Japan: Interspecies comparison of the residue levels and compositions

    H. Hoshi;N. Minamoto;H. Iwata;K. Shiraki

  • Q fever pneumonia in children in Japan.

    H To;N Kako;G Q Zhang;H Otsuka

  • Serological Evidence of Coxiella burnetii Infection in Wild Animals in Japan

    Castor Leo A. Ejercito;Lixun Cai;Khin Khin Htwe;Michihiro Taki

  • Phylogenetic analysis of the genus Chlamydia based on 16S rRNA gene sequences

    Pudjiatmoko;H Fukushi;Y Ochiai;T Yamaguchi

  • Geographic population structure and sequence divergence in the mitochondrial DNA control region of the Japanese wild boar (Sus scrofa leucomystax), with reference to those of domestic pigs

    Naohiko Okumura;Naotaka Ishiguro;Masuo Nakano;Katsuya Hirai

  • Immunochemical diversity of the major outer membrane protein of avian and mammalian Chlamydia psittaci.

    H Fukushi;K Hirai

  • Characterization of Immunosuppression in chickens by infectious bursal disease virus.

    Hirai K;Kunihiro K;Shimakura S

  • SCID mouse model for lethal Q fever.

    Masako Andoh;Takashi Naganawa;Akitoyo Hotta;Tsuyoshi Yamaguchi

  • Incidence of Listeria monocytogenes in wild animals in Japan.

    Tetsuya Yoshida;Tomoaki Sugimoto;Moritoshi Sato;Katsuya Hirai

  • VIRUS REACTIVATION IN BITCHES WITH A MEDICAL HISTORY OF HERPESVIRUS INFECTION

    Okuda Y;Ishida K;Hashimoto A;Yamaguchi T

Frequent Co-Authors

Hideto Fukushi
Hideto Fukushi Gifu University
James E. Samuel
James E. Samuel Texas A&M University
Yasuko Rikihisa
Yasuko Rikihisa The Ohio State University
Hiroshi Kida
Hiroshi Kida Hokkaido University
David N. McMurray
David N. McMurray Texas A&M University
Shinsuke Tanabe
Shinsuke Tanabe Ehime University
Hisato Iwata
Hisato Iwata Ehime University
Yasuyoshi Watanabe
Yasuyoshi Watanabe Osaka Metropolitan University
Takeshi Mikami
Takeshi Mikami University of Tokyo
Takeshi Kurata
Takeshi Kurata Juntendo University

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