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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Microbiology 64 2667 2444 99 92 274 9946

Keiji Oguma publications per year

The chart shows the history of publications by Keiji Oguma between 1973 and 2021, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Keiji Oguma published across 49 years, from 1973 to 2021, averaging 6.1 papers a year. Output peaked at 17 publications in 2009. 2 of the 298 publications appeared in the last two years.

No. of publications
5 10 15
Bar chart. Horizontal axis: year, 1973 to 2021. Vertical axis: number of publications, 0 to 17. Peak 17 publications in 2009. 1973: 1 publication 1974: 1 publication 1975: 4 publications 1976: 3 publications 1977: 1 publication 1978: 2 publications 1979: 3 publications 1980: 1 publication 1981: 2 publications 1982: 1 publication 1983: 2 publications 1984: 3 publications 1985: 1 publication 1986: 3 publications 1987: 1 publication 1988: 7 publications 1989: 5 publications 1990: 15 publications 1991: 13 publications 1992: 7 publications 1993: 9 publications 1994: 5 publications 1995: 9 publications 1996: 7 publications 1997: 9 publications 1998: 10 publications 1999: 12 publications 2000: 11 publications 2001: 12 publications 2002: 10 publications 2003: 16 publications 2004: 15 publications 2005: 11 publications 2006: 5 publications 2007: 15 publications 2008: 8 publications 2009: 17 publications 2010: 4 publications 2011: 10 publications 2012: 12 publications 2013: 4 publications 2014: 1 publication 2015: 6 publications 2016: 1 publication 2017: 1 publication 2018: 0 publications 2019: 0 publications 2020: 1 publication 2021: 1 publication
1973 2021

298 publications in total across all disciplines

View publications per year as a table
Keiji Oguma: publications per year, 1973 to 2021
Year Publications
1973 1
1974 1
1975 4
1976 3
1977 1
1978 2
1979 3
1980 1
1981 2
1982 1
1983 2
1984 3
1985 1
1986 3
1987 1
1988 7
1989 5
1990 15
1991 13
1992 7
1993 9
1994 5
1995 9
1996 7
1997 9
1998 10
1999 12
2000 11
2001 12
2002 10
2003 16
2004 15
2005 11
2006 5
2007 15
2008 8
2009 17
2010 4
2011 10
2012 12
2013 4
2014 1
2015 6
2016 1
2017 1
2018 0
2019 0
2020 1
2021 1
Total 298
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Keiji Oguma 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 Keiji Oguma sits on this spectrum.

No. of scientists
50 100 150 200 250
Bar chart with 64 bars. Horizontal axis: publications, 55–64 to 679+. Vertical axis: number of scientists, 0 to 288. Most scientists, 288, have 135–144 publications. The last bar groups every scientist with 679 publications or more. The highlighted bar, 265–274 publications, is where this scientist sits. 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: 265 scientists 155–164 publications: 264 scientists 165–174 publications: 253 scientists 175–184 publications: 276 scientists 185–194 publications: 190 scientists 195–204 publications: 234 scientists 205–214 publications: 208 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
55–64 publications 679+

This scientist: 274 publications — 71st percentile

71% of scientists in this discipline score the same or lower.

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

View publications distribution as a table
Number of Microbiology scientists by publication count, Research.com 2026 ranking edition. Based on 5,513 ranked scientists.
Publications Scientists This scientist
55–64 8
65–74 29
75–84 55
85–94 112
95–104 137
105–114 190
115–124 235
125–134 234
135–144 288
145–154 265
155–164 264
165–174 253
175–184 276
185–194 190
195–204 234
205–214 208
215–224 198
225–234 155
235–244 161
245–254 160
255–264 146
265–274 139 274
275–284 148
285–294 115
295–304 96
305–314 88
315–324 106
325–334 65
335–344 76
345–354 64
355–364 62
365–374 65
375–384 61
385–394 34
395–404 44
405–414 36
415–424 35
425–434 29
435–444 33
445–454 34
455–464 25
465–474 26
475–484 20
485–494 19
495–504 16
505–514 17
515–524 23
525–534 14
535–544 14
545–554 18
555–564 12
565–574 7
575–584 9
585–594 9
595–604 9
605–614 7
615–624 9
625–634 7
635–644 4
645–654 5
655–664 6
665–674 7
675–678 3
679+ 99
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Keiji Oguma 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 Keiji Oguma sits on this spectrum.

No. of scientists
50 100 150
Bar chart with 88 bars. Horizontal axis: D-Index, 40 to 127+. Vertical axis: number of scientists, 0 to 162. Most scientists, 162, have 58 D-Index. The last bar groups every scientist with 127 D-Index or more. The highlighted bar, 64 D-Index, is where this scientist sits. 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: 112 scientists 57 D-Index: 136 scientists 58 D-Index: 162 scientists 59 D-Index: 151 scientists 60 D-Index: 139 scientists 61 D-Index: 123 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: 94 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: 64 D-Index — 54th percentile

54% of scientists in this discipline score the same or lower.

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

View D-Index distribution as a table
Number of Microbiology scientists by D-index, Research.com 2026 ranking edition. Based on 5,513 ranked scientists.
D-Index Scientists This scientist
40 30
41 86
42 90
43 117
44 122
45 123
46 108
47 110
48 106
49 109
50 129
51 111
52 116
53 127
54 134
55 134
56 112
57 136
58 162
59 151
60 139
61 123
62 126
63 144
64 109 64
65 103
66 124
67 112
68 103
69 131
70 94
71 93
72 96
73 92
74 80
75 66
76 87
77 60
78 73
79 59
80 57
81 55
82 47
83 77
84 50
85 45
86 42
87 41
88 32
89 38
90 35
91 34
92 27
93 26
94 33
95 22
96 37
97 22
98 21
99 22
100 30
101 16
102 20
103 17
104 19
105 16
106 19
107 18
108 14
109 10
110 9
111 7
112 11
113 6
114 15
115 10
116 12
117 7
118 10
119 10
120 11
121 2
122 7
123 12
124 5
125 9
126 6
127+ 95
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Overview

Keiji Oguma is affiliated with Okayama University in Japan and has contributed to research primarily within the field of Medicine. Their work spans various subfields, including Infectious Diseases, Neurology, Public Health, Environmental and Occupational Health, Endocrinology, and Cardiology and Cardiovascular Medicine.

The scientist's research topics cover several specific areas such as Botulinum Toxin and Related Neurological Disorders, Streptococcal Infections and Treatments, Diphtheria, Corynebacterium, and Tetanus, SARS-CoV-2 and COVID-19 Research, COVID-19 Clinical Research Studies, and Viral Infections and Immunology Research.

Keiji Oguma has published in a range of venues, with recurring appearances in:

  • Anaerobe
  • Journal of Infection and Chemotherapy

Among their recent publications are the following papers:

  • Analysis of a plasmid encoding botulinum neurotoxin type G gene in Clostridium argentinense, 2020, Anaerobe
  • Antibody responses induced by the BNT162b2 mRNA COVID-19 vaccine in healthcare workers in a single community hospital in Japan, 2021, Journal of Infection and Chemotherapy

Frequent co-authors collaborating with Keiji Oguma include:

  • Yoshihiko Sakaguchi
  • Jumpei Uchiyama
  • A Take
  • Kazuyoshi Gotoh
  • Masakiyo Sakaguchi

Best Publications

  • The effect of eradicating helicobacter pylori on the development of gastric cancer in patients with peptic ulcer disease.

    Susumu Take;Motowo Mizuno;Kuniharu Ishiki;Yasuhiro Nagahara

  • Unique cholesteryl glucosides in Helicobacter pylori: composition and structural analysis.

    Y. Hirai;Mahmudul Haque;T. Yoshida;K. Yokota

  • Molecular composition of Clostridium botulinum type A progenitor toxins

    K Inoue;Y Fujinaga;T Watanabe;T Ohyama

  • The haemagglutinin of Clostridium botulinum type C progenitor toxin plays an essential role in binding of toxin to the epithelial cells of guinea pig small intestine, leading to the efficient absorption of the toxin

    Yukako Fujinaga;Kaoru Inoue;Sadahiro Watanabe;Kenji Yokota

  • Structure and Function of Clostridium botulinum Toxins

    Keiji Oguma;Yukako Fujinaga;Kaoru Inoue

  • The genome sequence of Clostridium botulinum type C neurotoxin-converting phage and the molecular mechanisms of unstable lysogeny

    Yoshihiko Sakaguchi;Tetsuya Hayashi;Ken Kurokawa;Keisuke Nakayama

  • Baseline gastric mucosal atrophy is a risk factor associated with the development of gastric cancer after Helicobacter pylori eradication therapy in patients with peptic ulcer diseases.

    Susumu Take;Motowo Mizuno;Kuniharu Ishiki;Yasuhiro Nagahara

  • Identification and characterization of functional subunits of Clostridium botulinum type A progenitor toxin involved in binding to intestinal microvilli and erythrocytes.

    Yukako Fujinaga;Kaoru Inoue;Takako Nomura;Junzo Sasaki

  • Lipid profile of Helicobacter spp.: presence of cholesteryl glucoside as a characteristic feature.

    Mahmudul Haque;Yoshikazu Hirai;Kenji Yokota;Noriko Mori

  • Helicobacter pylori heat-shock protein 60 induces interleukin-8 via a Toll-like receptor (TLR)2 and mitogen-activated protein (MAP) kinase pathway in human monocytes.

    Ying Zhao;Kenji Yokota;Kiyoshi Ayada;Yumiko Yamamoto

  • Chronic Infections and Atherosclerosis

    Kiyoshi Ayada;Kenji Yokota;Kazuko Kobayashi;Yehuda Shoenfeld;Yehuda Shoenfeld

  • The role of streptococcal hypersensitivity in the pathogenesis of Behçet's Disease.

    Fumio Kaneko;Noritaka Oyama;Hirokatsu Yanagihori;Emiko Isogai

  • The HA proteins of botulinum toxin disrupt intestinal epithelial intercellular junctions to increase toxin absorption.

    Takuhiro Matsumura;Yingji Jin;Yingji Jin;Yuko Kabumoto;Yuki Takegahara

  • Helicobacter pylori heat-shock protein 60 induces inflammatory responses through the Toll-like receptor-triggered pathway in cultured human gastric epithelial cells.

    Ryuta Takenaka;Kenji Yokota;Kiyoshi Ayada;Motowo Mizuno

  • Production of anti-neurotoxin antibody is enhanced by two subcomponents, HA1 and HA3b, of Clostridium botulinum type B 16S toxin–haemagglutinin

    Jae Chul Lee;Kenji Yokota;Hideyuki Arimitsu;Hyun Jung Hwang

  • Simple Method for Detection of Clostridium botulinum Type A to F Neurotoxin Genes by Ploymerase Chain Reaction

    Kouichi Takeshi;Yukako Fujinaga;Kaoru Inoue;Hiroshi Nakajima

  • Structure and Function of Clostridium Botulinum Progenitor Toxin

    K. Oguma;K. Inoue;Y. Fujinaga;K. Yokota

  • Molecular characterization of binding subcomponents of Clostridium botulinum type C progenitor toxin for intestinal epithelial cells and erythrocytes.

    Yukako Fujinaga;Kaoru Inoue;Shinobu Watarai;Yoshihiko Sakaguchi

  • Chemiluminescence of neutrophils from patients with Behçet's disease and its correlation with an increased proportion of uncommon serotypes of Streptococcus sanguis in the oral flora

    E. Isogai;S. Ohno;S. Kotake;H. Isogai

  • Infant botulism due to Clostridium botulinum type C toxin.

    Keiji Oguma;Kenji Yokota;Shunji Hayashi;Koichi Takeshi

Frequent Co-Authors

Nobuhiro Fujii
Nobuhiro Fujii Sapporo Medical University
Shigeaki Ohno
Shigeaki Ohno Hokkaido University
Yasushi Shiratori
Yasushi Shiratori Okayama University
Tadashi Yoshino
Tadashi Yoshino Okayama University
Eiji Matsuura
Eiji Matsuura Okayama University
Masahiro Asaka
Masahiro Asaka Hokkaido University
Igor Spigelman
Igor Spigelman University of California, Los Angeles
Koki Taniguchi
Koki Taniguchi Fujita Health University
Norihisa Ishii
Norihisa Ishii National Institutes of Biomedical Innovation, Health and Nutrition
Masayuki Saito
Masayuki Saito Hokkaido University

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