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John H. Ouma

John H. Ouma

Maseno University
Kenya

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Biology and Biochemistry
Kenya
2026

D-Index & Metrics

Biology and Biochemistry

D-Index
77
Citations
14781
World Ranking
4904
National Ranking
2

John H. Ouma publication distribution in Biology and Biochemistry in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Biology and Biochemistry in 2026. The highlighted bar marks where John H. Ouma sits on this spectrum.

47–56 publications: 8 scientists 57–66 publications: 35 scientists 67–76 publications: 106 scientists 77–86 publications: 231 scientists 87–96 publications: 414 scientists 97–106 publications: 546 scientists 107–116 publications: 704 scientists 117–126 publications: 849 scientists 127–136 publications: 980 scientists 137–146 publications: 942 scientists 147–156 publications: 969 scientists 157–166 publications: 950 scientists 167–176 publications: 951 scientists 177–186 publications: 915 scientists 187–196 publications: 787 scientists 197–206 publications: 841 scientists 207–216 publications: 735 scientists 217–226 publications: 709 scientists 227–236 publications: 651 scientists 237–246 publications: 605 scientists 247–256 publications: 510 scientists 257–266 publications: 524 scientists 267–276 publications: 434 scientists 277–286 publications: 418 scientists 287–296 publications: 350 scientists 297–306 publications: 363 scientists 307–316 publications: 315 scientists 317–326 publications: 296 scientists 327–336 publications: 261 scientists 337–346 publications: 240 scientists 347–356 publications: 219 scientists 357–366 publications: 197 scientists 367–376 publications: 154 scientists 377–386 publications: 161 scientists 387–396 publications: 155 scientists 397–406 publications: 145 scientists 407–416 publications: 124 scientists 417–426 publications: 112 scientists 427–436 publications: 132 scientists 437–446 publications: 116 scientists 447–456 publications: 99 scientists 457–466 publications: 81 scientists 467–476 publications: 91 scientists 477–486 publications: 80 scientists 487–496 publications: 80 scientists 497–506 publications: 60 scientists 507–516 publications: 36 scientists 517–526 publications: 46 scientists 527–536 publications: 54 scientists 537–546 publications: 44 scientists 547–556 publications: 43 scientists 557–566 publications: 43 scientists 567–576 publications: 42 scientists 577–586 publications: 25 scientists 587–596 publications: 34 scientists 597–606 publications: 23 scientists 607–616 publications: 33 scientists 617–626 publications: 31 scientists 627–636 publications: 27 scientists 637–646 publications: 25 scientists 647–656 publications: 28 scientists 657–666 publications: 34 scientists 667–676 publications: 18 scientists 677–686 publications: 16 scientists 687–696 publications: 10 scientists 697–706 publications: 12 scientists 707–716 publications: 21 scientists 717–726 publications: 12 scientists 727–736 publications: 12 scientists 737–746 publications: 10 scientists 747–756 publications: 7 scientists 757–766 publications: 13 scientists 767–776 publications: 15 scientists 777–786 publications: 13 scientists 787–796 publications: 9 scientists 797–806 publications: 9 scientists 807–816 publications: 7 scientists 817–826 publications: 4 scientists 827–836 publications: 9 scientists 837–846 publications: 7 scientists 847–856 publications: 3 scientists 857–866 publications: 5 scientists 867–876 publications: 5 scientists 877–886 publications: 11 scientists 887–896 publications: 3 scientists 897–906 publications: 4 scientists 907–916 publications: 7 scientists 917–926 publications: 5 scientists 927–936 publications: 6 scientists 937–946 publications: 6 scientists 947–956 publications: 3 scientists 957–966 publications: 7 scientists 967–976 publications: 2 scientists 977–986 publications: 2 scientists 987–996 publications: 1 scientists 997–1,006 publications: 5 scientists 1,007–1,016 publications: 2 scientists 1,017–1,026 publications: 2 scientists 1,027 publications: 1 scientists 1,028+ publications: 100 scientists
47 publications 1,028+

This scientist: 191 publications — 46th percentile

46% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,028 publications or more.

John H. Ouma D-index placement in Biology and Biochemistry in 2026

The chart shows the D-index (discipline H-index) distribution of Biology and Biochemistry scientists ranked by Research.com in 2026. The highlighted bar marks where John H. Ouma sits on this spectrum.

40–41 D-Index: 80 scientists 42–43 D-Index: 183 scientists 44–45 D-Index: 317 scientists 46–47 D-Index: 504 scientists 48–49 D-Index: 718 scientists 50–51 D-Index: 900 scientists 52–53 D-Index: 1,026 scientists 54–55 D-Index: 1,150 scientists 56–57 D-Index: 1,236 scientists 58–59 D-Index: 1,253 scientists 60–61 D-Index: 1,163 scientists 62–63 D-Index: 1,131 scientists 64–65 D-Index: 1,032 scientists 66–67 D-Index: 897 scientists 68–69 D-Index: 814 scientists 70–71 D-Index: 715 scientists 72–73 D-Index: 709 scientists 74–75 D-Index: 596 scientists 76–77 D-Index: 512 scientists 78–79 D-Index: 473 scientists 80–81 D-Index: 412 scientists 82–83 D-Index: 373 scientists 84–85 D-Index: 358 scientists 86–87 D-Index: 285 scientists 88–89 D-Index: 273 scientists 90–91 D-Index: 227 scientists 92–93 D-Index: 208 scientists 94–95 D-Index: 193 scientists 96–97 D-Index: 153 scientists 98–99 D-Index: 157 scientists 100–101 D-Index: 148 scientists 102–103 D-Index: 120 scientists 104–105 D-Index: 113 scientists 106–107 D-Index: 100 scientists 108–109 D-Index: 86 scientists 110–111 D-Index: 67 scientists 112–113 D-Index: 72 scientists 114–115 D-Index: 73 scientists 116–117 D-Index: 64 scientists 118–119 D-Index: 53 scientists 120–121 D-Index: 60 scientists 122–123 D-Index: 54 scientists 124–125 D-Index: 43 scientists 126–127 D-Index: 38 scientists 128–129 D-Index: 49 scientists 130–131 D-Index: 26 scientists 132–133 D-Index: 18 scientists 134–135 D-Index: 23 scientists 136–137 D-Index: 32 scientists 138–139 D-Index: 32 scientists 140–141 D-Index: 27 scientists 142–143 D-Index: 19 scientists 144–145 D-Index: 22 scientists 146–147 D-Index: 12 scientists 148–149 D-Index: 16 scientists 150–151 D-Index: 14 scientists 152–153 D-Index: 10 scientists 154–155 D-Index: 13 scientists 156–157 D-Index: 10 scientists 158–159 D-Index: 7 scientists 160–161 D-Index: 9 scientists 162–163 D-Index: 13 scientists 164–165 D-Index: 4 scientists 166 D-Index: 4 scientists 167+ D-Index: 98 scientists
40 D-Index 167+

This scientist: 77 D-Index — 76th percentile

76% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 167 D-Index or more.

Research.com Recognitions

  • 2026 - Research.com Biology and Biochemistry in Kenya Leader Award
  • 2025 - Research.com Biology and Biochemistry in Kenya Leader Award

Overview

John H. Ouma is affiliated with Maseno University in Kenya and conducts research primarily within the field of Medicine. Their work concentrates on subfields including Epidemiology, Neurology, and Pulmonary and Respiratory Medicine.

The scientist has contributed to topics such as:

  • Meningioma and schwannoma management
  • Traumatic Brain Injury and Neurovascular Disturbances
  • Intracranial Aneurysms: Treatment and Complications
  • Aortic Disease and Treatment Approaches
  • Congenital Heart Disease Studies
  • Tracheal and airway disorders

Recent research papers by John H. Ouma include:

  • 5 Birds with 1 stone - multiple aneurysms treated with a single craniotomy, 2023, published in Wits Journal of Clinical Medicine
  • The significance and impact of a rare finding of a right aortic arch during a neuro-endovascular intervention, 2025, published in The Egyptian Journal of Neurosurgery: the official publication of the Egyptian Society of Neurological Surgeons/Egyptian journal of neurosurgery

Frequent co-authors collaborating with John H. Ouma are:

  • Adhiambo Philister
  • Reenish Madiega
  • Emmah Achieng' Mbuge
  • Philip Odundo
  • Collins Gem

Publication venues where John H. Ouma has contributed include:

  • Wits Journal of Clinical Medicine
  • The Egyptian Journal of Neurosurgery: the official publication of the Egyptian Society of Neurological Surgeons/Egyptian journal of neurosurgery

Best Publications

  • Averting a malaria disaster.

    NJ White;F Nosten;S Looareesuwan;WM Watkins

  • Immunity after treatment of human schistosomiasis: association between IgE antibodies to adult worm antigens and resistance to reinfection

    D. W. Dunne;A. E. Butterworth;A. J. C. Fulford;H. C. Kariuki

  • Immunity after treatment of human schistosomiasis mansoni. II. Identification of resistant individuals, and analysis of their immune responses

    A.E. Butterworth;M. Capron;J.S. Cordingley;P.R. Dalton

  • Relationships between Plasmodium Falciparum Transmission by Vector Populations and the Incidence of Severe Disease at Nine Sites on the Kenyan Coast

    Charles N. M. Mbogo;Robert W. Snow;Canute P. M. Khamala;Ephantus W. Kabiru

  • Field studies of a rapid, accurate means of quantifying Schistosoma haematobium eggs in urine samples.

    P. A. Peters;A. A. F. Mahmoud;K. S. Warren;J. H. Ouma

  • IgA Antibodies to a Protective Antigen in Human Schistosomiasis Mansoni

    J.-M. Grzych;D. Grezel;Chuan Bo Xu;J.-L. Neyrinck

  • Adult resistance to schistosomiasis mansoni: age-dependence of reinfection remains constant in communities with diverse exposure patterns.

    N. B. Kabatereine;B. J. Vennervald;J. H. Ouma;J. Kemijumbi

  • Immunity in human schistosomiasis mansoni: prevention by blocking antibodies of the expression of immunity in young children.

    A. E. Butterworth;R. Bensted-Smith;A. Capron;M. Capron

  • Can prenatal malaria exposure produce an immune tolerant phenotype?: A prospective birth cohort study in Kenya

    Indu Malhotra;Arlene Elizabeth Dent;Peter Mungai;Alex Wamachi

  • Double-blind placebo-controlled study of concurrent administration of albendazole and praziquantel in schoolchildren with schistosomiasis and geohelminths.

    G. R. Olds;C. King;J. Hewlett;R. Olveda

  • IL-13 receptor α 2 down-modulates granulomatous inflammation and prolongs host survival in schistosomiasis

    Margaret M. Mentink-Kane;Allen W. Cheever;Robert W. Thompson;Danielle M. Hari

  • Puberty and Age-related Changes in Susceptibility to Schistosome Infection

    A.J.C. Fulford;M. Webster;J.H. Ouma;G. Kimani

  • The effects of maternal helminth and malaria infections on mother-to-child HIV transmission.

    Maureen Gallagher;Indu Malhotra;Peter L Mungai;Alex N Wamachi

  • Earth-eating and reinfection with intestinal helminths among pregnant and lactating women in western Kenya.

    Alfred I. Luoba;P. Wenzel Geissler;Benson Estambale;John H. Ouma

  • The contribution of hookworm and other parasitic infections to haemoglobin and iron status among children and adults in western Kenya.

    A. Olsen;P. Magnussen;J.H. Ouma;J. Andreassen

  • A statistical approach to schistosome population dynamics and estimation of the life-span of Schistosoma mansoni in man.

    A. J. C. Fulford;A. E. Butterworth;J. H. Ouma;R. F. Sturrock

  • Factors affecting infection or reinfection with Schistosoma haematobium in coastal Kenya: survival analysis during a nine-year, school-based treatment program.

    Sudtida A. Satayathum;Eric M. Muchiri;John H. Ouma;Christopher C. Whalen

  • Immunity after treatment of human schistosomiasis mansoni. I. Study design, pretreatment observations and the results of treatment.

    A.E. Butterworth;P.R. Dalton;D.W. Dunne;M. Mugambi

  • Distinct Th1- and Th2-Type Prenatal Cytokine Responses to Plasmodium falciparum Erythrocyte Invasion Ligands

    Indu Malhotra;Peter Mungai;Eric Muchiri;John Ouma

  • DISTRIBUTION PATTERNS AND CERCARIAL SHEDDING OF BULINUS NASUTUS AND OTHER SNAILS IN THE MSAMBWENI AREA, COAST PROVINCE, KENYA

    H. Curtis Kariuki;Julie A. Clennon;Melinda S. Brady;Uriel Kitron

Frequent Co-Authors

Anthony E. Butterworth
Anthony E. Butterworth University of Cambridge
David W. Dunne
David W. Dunne University of Cambridge
Eric M. Muchiri
Eric M. Muchiri Case Western Reserve University
Adel A. F. Mahmoud
Adel A. F. Mahmoud Princeton University
Birgitte J. Vennervald
Birgitte J. Vennervald University of Copenhagen
Charles H. King
Charles H. King Case Western Reserve University
Narcis B. Kabatereine
Narcis B. Kabatereine Imperial College London
Christopher L. King
Christopher L. King Case Western Reserve University
James W. Kazura
James W. Kazura Case Western Reserve University
Roy M. Anderson
Roy M. Anderson Imperial College London

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Best Scientists Citing John H. Ouma

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Publications: 67

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University of Copenhagen

Publications: 56

John H. Ouma

John H. Ouma

Kenya Medical Research Institute

Publications: 55

Simon Brooker

Simon Brooker

Bill & Melinda Gates Foundation

Publications: 47

Alan Fenwick

Alan Fenwick

Imperial College London

Publications: 46

André Capron

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Institut Pasteur

Publications: 42

Jeffrey M. Bethony

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Publications: 39

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University of Georgia

Publications: 38

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Publications: 38

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