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Medicine
Ireland
2026

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Medicine 147 1277 1181 5 5 883 84604

Fergus Shanahan publications per year

The chart shows the history of publications by Fergus Shanahan between 1977 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Fergus Shanahan published across 49 years, from 1977 to 2025, averaging 20.8 papers a year. Output peaked at 101 publications in 2023. 19 of the 1,021 publications appeared in the last two years.

No. of publications
25 50 75 100
Bar chart. Horizontal axis: year, 1977 to 2025. Vertical axis: number of publications, 0 to 101. Peak 101 publications in 2023. 1977: 1 publication 1978: 1 publication 1979: 0 publications 1980: 0 publications 1981: 4 publications 1982: 2 publications 1983: 4 publications 1984: 3 publications 1985: 5 publications 1986: 6 publications 1987: 7 publications 1988: 8 publications 1989: 8 publications 1990: 4 publications 1991: 13 publications 1992: 8 publications 1993: 16 publications 1994: 17 publications 1995: 16 publications 1996: 11 publications 1997: 17 publications 1998: 33 publications 1999: 25 publications 2000: 38 publications 2001: 36 publications 2002: 29 publications 2003: 31 publications 2004: 24 publications 2005: 17 publications 2006: 36 publications 2007: 22 publications 2008: 37 publications 2009: 40 publications 2010: 46 publications 2011: 35 publications 2012: 53 publications 2013: 38 publications 2014: 37 publications 2015: 30 publications 2016: 20 publications 2017: 25 publications 2018: 16 publications 2019: 20 publications 2020: 21 publications 2021: 23 publications 2022: 18 publications 2023: 101 publications 2024: 11 publications 2025: 8 publications
1977 2025

1,021 publications in total across all disciplines

View publications per year as a table
Fergus Shanahan: publications per year, 1977 to 2025
Year Publications
1977 1
1978 1
1979 0
1980 0
1981 4
1982 2
1983 4
1984 3
1985 5
1986 6
1987 7
1988 8
1989 8
1990 4
1991 13
1992 8
1993 16
1994 17
1995 16
1996 11
1997 17
1998 33
1999 25
2000 38
2001 36
2002 29
2003 31
2004 24
2005 17
2006 36
2007 22
2008 37
2009 40
2010 46
2011 35
2012 53
2013 38
2014 37
2015 30
2016 20
2017 25
2018 16
2019 20
2020 21
2021 23
2022 18
2023 101
2024 11
2025 8
Total 1,021
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Fergus Shanahan publication distribution in Medicine in 2026

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

No. of scientists
200 400 600 800
Bar chart with 86 bars. Horizontal axis: publications, 101–120 to 1,796+. Vertical axis: number of scientists, 0 to 922. Most scientists, 922, have 341–360 publications. The last bar groups every scientist with 1,796 publications or more. The highlighted bar, 881–900 publications, is where this scientist sits. 101–120 publications: 5 scientists 121–140 publications: 26 scientists 141–160 publications: 73 scientists 161–180 publications: 155 scientists 181–200 publications: 230 scientists 201–220 publications: 363 scientists 221–240 publications: 487 scientists 241–260 publications: 545 scientists 261–280 publications: 722 scientists 281–300 publications: 768 scientists 301–320 publications: 834 scientists 321–340 publications: 895 scientists 341–360 publications: 922 scientists 361–380 publications: 838 scientists 381–400 publications: 861 scientists 401–420 publications: 918 scientists 421–440 publications: 806 scientists 441–460 publications: 771 scientists 461–480 publications: 751 scientists 481–500 publications: 713 scientists 501–520 publications: 617 scientists 521–540 publications: 610 scientists 541–560 publications: 537 scientists 561–580 publications: 504 scientists 581–600 publications: 509 scientists 601–620 publications: 396 scientists 621–640 publications: 386 scientists 641–660 publications: 371 scientists 661–680 publications: 340 scientists 681–700 publications: 336 scientists 701–720 publications: 307 scientists 721–740 publications: 259 scientists 741–760 publications: 230 scientists 761–780 publications: 228 scientists 781–800 publications: 217 scientists 801–820 publications: 204 scientists 821–840 publications: 186 scientists 841–860 publications: 177 scientists 861–880 publications: 155 scientists 881–900 publications: 139 scientists 901–920 publications: 145 scientists 921–940 publications: 116 scientists 941–960 publications: 133 scientists 961–980 publications: 91 scientists 981–1,000 publications: 96 scientists 1,001–1,020 publications: 77 scientists 1,021–1,040 publications: 70 scientists 1,041–1,060 publications: 63 scientists 1,061–1,080 publications: 77 scientists 1,081–1,100 publications: 49 scientists 1,101–1,120 publications: 54 scientists 1,121–1,140 publications: 49 scientists 1,141–1,160 publications: 51 scientists 1,161–1,180 publications: 35 scientists 1,181–1,200 publications: 39 scientists 1,201–1,220 publications: 26 scientists 1,221–1,240 publications: 37 scientists 1,241–1,260 publications: 36 scientists 1,261–1,280 publications: 27 scientists 1,281–1,300 publications: 32 scientists 1,301–1,320 publications: 28 scientists 1,321–1,340 publications: 17 scientists 1,341–1,360 publications: 30 scientists 1,361–1,380 publications: 28 scientists 1,381–1,400 publications: 17 scientists 1,401–1,420 publications: 21 scientists 1,421–1,440 publications: 15 scientists 1,441–1,460 publications: 12 scientists 1,461–1,480 publications: 12 scientists 1,481–1,500 publications: 18 scientists 1,501–1,520 publications: 14 scientists 1,521–1,540 publications: 17 scientists 1,541–1,560 publications: 15 scientists 1,561–1,580 publications: 6 scientists 1,581–1,600 publications: 2 scientists 1,601–1,620 publications: 12 scientists 1,621–1,640 publications: 11 scientists 1,641–1,660 publications: 8 scientists 1,661–1,680 publications: 5 scientists 1,681–1,700 publications: 5 scientists 1,701–1,720 publications: 10 scientists 1,721–1,740 publications: 12 scientists 1,741–1,760 publications: 14 scientists 1,761–1,780 publications: 6 scientists 1,781–1,795 publications: 5 scientists 1,796+ publications: 100 scientists
101–120 publications 1,796+

This scientist: 883 publications — 91st percentile

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

The last bar groups every scientist with 1,796 publications or more.

View publications distribution as a table
Number of Medicine scientists by publication count, Research.com 2026 ranking edition. Based on 20,134 ranked scientists.
Publications Scientists This scientist
101–120 5
121–140 26
141–160 73
161–180 155
181–200 230
201–220 363
221–240 487
241–260 545
261–280 722
281–300 768
301–320 834
321–340 895
341–360 922
361–380 838
381–400 861
401–420 918
421–440 806
441–460 771
461–480 751
481–500 713
501–520 617
521–540 610
541–560 537
561–580 504
581–600 509
601–620 396
621–640 386
641–660 371
661–680 340
681–700 336
701–720 307
721–740 259
741–760 230
761–780 228
781–800 217
801–820 204
821–840 186
841–860 177
861–880 155
881–900 139 883
901–920 145
921–940 116
941–960 133
961–980 91
981–1,000 96
1,001–1,020 77
1,021–1,040 70
1,041–1,060 63
1,061–1,080 77
1,081–1,100 49
1,101–1,120 54
1,121–1,140 49
1,141–1,160 51
1,161–1,180 35
1,181–1,200 39
1,201–1,220 26
1,221–1,240 37
1,241–1,260 36
1,261–1,280 27
1,281–1,300 32
1,301–1,320 28
1,321–1,340 17
1,341–1,360 30
1,361–1,380 28
1,381–1,400 17
1,401–1,420 21
1,421–1,440 15
1,441–1,460 12
1,461–1,480 12
1,481–1,500 18
1,501–1,520 14
1,521–1,540 17
1,541–1,560 15
1,561–1,580 6
1,581–1,600 2
1,601–1,620 12
1,621–1,640 11
1,641–1,660 8
1,661–1,680 5
1,681–1,700 5
1,701–1,720 10
1,721–1,740 12
1,741–1,760 14
1,761–1,780 6
1,781–1,795 5
1,796+ 100
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Fergus Shanahan D-index placement in Medicine in 2026

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

No. of scientists
250 500 750 1,000
Bar chart with 75 bars. Horizontal axis: D-Index, 70–71 to 217+. Vertical axis: number of scientists, 0 to 1,027. Most scientists, 1,027, have 82–83 D-Index. The last bar groups every scientist with 217 D-Index or more. The highlighted bar, 146–147 D-Index, is where this scientist sits. 70–71 D-Index: 226 scientists 72–73 D-Index: 391 scientists 74–75 D-Index: 574 scientists 76–77 D-Index: 730 scientists 78–79 D-Index: 891 scientists 80–81 D-Index: 972 scientists 82–83 D-Index: 1,027 scientists 84–85 D-Index: 1,003 scientists 86–87 D-Index: 960 scientists 88–89 D-Index: 970 scientists 90–91 D-Index: 922 scientists 92–93 D-Index: 839 scientists 94–95 D-Index: 808 scientists 96–97 D-Index: 779 scientists 98–99 D-Index: 668 scientists 100–101 D-Index: 611 scientists 102–103 D-Index: 630 scientists 104–105 D-Index: 513 scientists 106–107 D-Index: 541 scientists 108–109 D-Index: 445 scientists 110–111 D-Index: 429 scientists 112–113 D-Index: 399 scientists 114–115 D-Index: 393 scientists 116–117 D-Index: 318 scientists 118–119 D-Index: 302 scientists 120–121 D-Index: 287 scientists 122–123 D-Index: 255 scientists 124–125 D-Index: 256 scientists 126–127 D-Index: 252 scientists 128–129 D-Index: 230 scientists 130–131 D-Index: 179 scientists 132–133 D-Index: 168 scientists 134–135 D-Index: 163 scientists 136–137 D-Index: 159 scientists 138–139 D-Index: 134 scientists 140–141 D-Index: 134 scientists 142–143 D-Index: 118 scientists 144–145 D-Index: 109 scientists 146–147 D-Index: 106 scientists 148–149 D-Index: 74 scientists 150–151 D-Index: 79 scientists 152–153 D-Index: 80 scientists 154–155 D-Index: 87 scientists 156–157 D-Index: 57 scientists 158–159 D-Index: 74 scientists 160–161 D-Index: 69 scientists 162–163 D-Index: 60 scientists 164–165 D-Index: 53 scientists 166–167 D-Index: 39 scientists 168–169 D-Index: 42 scientists 170–171 D-Index: 32 scientists 172–173 D-Index: 39 scientists 174–175 D-Index: 40 scientists 176–177 D-Index: 28 scientists 178–179 D-Index: 19 scientists 180–181 D-Index: 23 scientists 182–183 D-Index: 31 scientists 184–185 D-Index: 18 scientists 186–187 D-Index: 20 scientists 188–189 D-Index: 22 scientists 190–191 D-Index: 13 scientists 192–193 D-Index: 21 scientists 194–195 D-Index: 12 scientists 196–197 D-Index: 12 scientists 198–199 D-Index: 14 scientists 200–201 D-Index: 15 scientists 202–203 D-Index: 13 scientists 204–205 D-Index: 10 scientists 206–207 D-Index: 8 scientists 208–209 D-Index: 4 scientists 210–211 D-Index: 12 scientists 212–213 D-Index: 11 scientists 214–215 D-Index: 10 scientists 216 D-Index: 4 scientists 217+ D-Index: 98 scientists
70–71 D-Index 217+

This scientist: 147 D-Index — 94th percentile

94% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 217 D-Index or more.

View D-Index distribution as a table
Number of Medicine scientists by D-index, Research.com 2026 ranking edition. Based on 20,134 ranked scientists.
D-Index Scientists This scientist
70–71 226
72–73 391
74–75 574
76–77 730
78–79 891
80–81 972
82–83 1,027
84–85 1,003
86–87 960
88–89 970
90–91 922
92–93 839
94–95 808
96–97 779
98–99 668
100–101 611
102–103 630
104–105 513
106–107 541
108–109 445
110–111 429
112–113 399
114–115 393
116–117 318
118–119 302
120–121 287
122–123 255
124–125 256
126–127 252
128–129 230
130–131 179
132–133 168
134–135 163
136–137 159
138–139 134
140–141 134
142–143 118
144–145 109
146–147 106 147
148–149 74
150–151 79
152–153 80
154–155 87
156–157 57
158–159 74
160–161 69
162–163 60
164–165 53
166–167 39
168–169 42
170–171 32
172–173 39
174–175 40
176–177 28
178–179 19
180–181 23
182–183 31
184–185 18
186–187 20
188–189 22
190–191 13
192–193 21
194–195 12
196–197 12
198–199 14
200–201 15
202–203 13
204–205 10
206–207 8
208–209 4
210–211 12
212–213 11
214–215 10
216 4
217+ 98
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Research.com Recognitions

  • 2026 - Research.com Medicine in Ireland Leader Award
  • 2025 - Research.com Medicine in Ireland Leader Award
  • 2023 - Research.com Medicine in Ireland Leader Award
  • 2022 - Research.com Medicine in Ireland Leader Award
  • 2017 - Member of the Royal Irish Academy
  • 2016 - Gold Medal, Royal Irish Academy Life Sciences

Overview

Fergus Shanahan is affiliated with the National University of Ireland in Ireland. Their research primarily focuses on the gut microbiome and its relationship to health, contributing extensively to the fields of Medicine and Biochemistry, Genetics and Molecular Biology.

The main scientific topics covered in their work include:

  • Gut microbiota and health
  • Clostridium difficile and Clostridium perfringens research
  • Diet and metabolism studies
  • Gastrointestinal motility and disorders
  • Helicobacter pylori-related gastroenterology studies
  • Microscopic Colitis
  • Inflammatory Bowel Disease

Shanahan's subfields of study reflect a strong molecular and physiological approach, including:

  • Molecular Biology
  • Physiology
  • Surgery
  • Epidemiology
  • Infectious Diseases

They have collaborated frequently with other researchers such as Paul W. O'Toole, Tarini Shankar Ghosh, Silvia Melgar, Kenneth Nally, and Paul D. Cotter, showcasing a multidisciplinary research network.

Shanahan publishes regularly in well-known venues, with recurrent contributions to:

  • bioRxiv (Cold Spring Harbor Laboratory)
  • Gastroenterology
  • Gut Microbes
  • Scientific Reports
  • International Journal of Molecular Sciences

Notable recent papers include:

  • The gut microbiome as a modulator of healthy ageing, 2022, Nature Reviews Gastroenterology & Hepatology
  • Establishing or Exaggerating Causality for the Gut Microbiome: Lessons from Human Microbiota-Associated Rodents, 2020, Cell
  • The Healthy Microbiome-What Is the Definition of a Healthy Gut Microbiome?, 2020, Gastroenterology
  • Questioning the fetal microbiome illustrates pitfalls of low-biomass microbial studies, 2023, Nature
  • Colonic microbiota is associated with inflammation and host epigenomic alterations in inflammatory bowel disease, 2020, Nature Communications

They have been recognized with distinctions such as the Gold Medal from the Royal Irish Academy in 2016 for Life Sciences and were elected a Member of the Royal Irish Academy in 2017.

Best Publications

  • Gut microbiota composition correlates with diet and health in the elderly

    Marcus J. Claesson;Ian B. Jeffery;Susana Conde;Susan E. Power

  • The gut flora as a forgotten organ

    Ann M O'Hara;Fergus Shanahan

  • The microbiome-gut-brain axis during early life regulates the hippocampal serotonergic system in a sex-dependent manner

    G Clarke;S Grenham;P Scully;P Fitzgerald

  • Composition, variability, and temporal stability of the intestinal microbiota of the elderly

    Marcus J. Claesson;Siobhán Cusack;Orla O'Sullivan;Rachel Greene-Diniz

  • Lactobacillus and bifidobacterium in irritable bowel syndrome: Symptom responses and relationship to cytokine profiles

    Liam O’Mahony;Jane McCarthy;Peter Kelly;George Hurley

  • Exercise and associated dietary extremes impact on gut microbial diversity

    Siobhan F Clarke;Siobhan F Clarke;Eileen F Murphy;Orla O'Sullivan;Alice J Lucey

  • In vitro selection criteria for probiotic bacteria of human origin: correlation with in vivo findings

    C Dunne;L O'Mahony;L Murphy;G Thornton

  • Enterotypes in the landscape of gut microbial community composition

    Paul I. Costea;Falk Hildebrand;Manimozhiyan Arumugam;Fredrik Bäckhed;Fredrik Bäckhed

  • The fas counterattack : fas-mediated T cell killing by colon cancer cells expressing fas ligand

    J O'Connell;G C O'Sullivan;J K Collins;F Shanahan

  • Composition and energy harvesting capacity of the gut microbiota: relationship to diet, obesity and time in mouse models

    E. F. Murphy;P. D. Cotter;P. D. Cotter;S. Healy;Tatiana M. Marques;Tatiana M. Marques

  • Efficacy of an encapsulated probiotic Bifidobacterium infantis 35624 in women with irritable bowel syndrome.

    Peter J. Whorwell;Linda Altringer;Jorge Morel;Yvonne Bond

  • Microbiota is essential for social development in the mouse

    L Desbonnet;G Clarke;F Shanahan;T G Dinan

  • The role of substance P in inflammatory disease.

    Terence M. O'Connor;Joseph O'Connell;Darren I. O'Brien;Triona Goode

  • Tumour-associated and non-tumour-associated microbiota in colorectal cancer

    Burkhardt Flemer;Denise B. Lynch;Jillian R. M. Brown;Ian B. Jeffery

  • Hypothalamic-pituitary-gut axis dysregulation in irritable bowel syndrome: plasma cytokines as a potential biomarker?

    Timothy G. Dinan;Eamonn Martin Quigley;Salah M M Ahmed;Paul Scully

  • Are we telling patients the truth about surveillance colonoscopy in ulcerative colitis

    F. Shanahan;W.M. Weinstein;C.N. Bernstein

  • Rapid and Noninvasive Metabonomic Characterization of Inflammatory Bowel Disease

    Julian Roberto Marchesi;Elaine Holmes;Fatima Khan;Sunil Kochhar

  • Crohn's disease

    Fergus Shanahan

  • A distinct subset of antineutrophil cytoplasmic antibodies is associated with inflammatory bowel disease

    Andrew Saxon;Fergus Shanahan;Carol Landers;Tomas Ganz

  • Probiotics: from myth to reality. Demonstration of functionality in animal models of disease and in human clinical trials.

    Colum Dunne;Lisa Murphy;Sarah Flynn;Liam O'Mahony

Frequent Co-Authors

Eamonn Martin Quigley
Eamonn Martin Quigley Cornell University
Liam O'Mahony
Liam O'Mahony University College Cork
Orla O'Sullivan
Orla O'Sullivan Teagasc - The Irish Agriculture and Food Development Authority
Catherine Stanton
Catherine Stanton Teagasc - The Irish Agriculture and Food Development Authority
John Kevin Collins
John Kevin Collins University College Cork
Timothy G. Dinan
Timothy G. Dinan University College Cork
Paul D. Cotter
Paul D. Cotter University College Cork
R. Paul Ross
R. Paul Ross University College Cork
Paul W. O'Toole
Paul W. O'Toole University College Cork
John F. Cryan
John F. Cryan University College Cork

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