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Medicine
Ireland
2026

D-Index & Metrics

Medicine

D-Index
147
Citations
84604
World Ranking
1277
National Ranking
5

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.

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: 611 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 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.

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.

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: 400 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 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.

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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