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Microbiology
Kenya
2026

D-Index & Metrics

Microbiology

D-Index
77
Citations
14200
World Ranking
1378
National Ranking
2

John H. Ouma 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 John H. Ouma 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: 178 publications — 40th percentile

40% of scientists in this discipline score the same or lower.

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

John H. Ouma 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 John H. Ouma 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: 77 D-Index — 76th percentile

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

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

Research.com Recognitions

  • 2026 - Research.com Microbiology in Kenya Leader Award

Overview

John H. Ouma is affiliated with the Kenya Medical Research Institute in Kenya and has contributed to research primarily within the field of Medicine. Their work spans several related subfields including Epidemiology, Neurology, and Pulmonary and Respiratory Medicine.

The research topics commonly addressed by John H. Ouma cover a range of clinical and neurological conditions. These include:

  • 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

Their recent publications reflect these research interests and include the following papers:

  • 5 Birds with 1 stone - multiple aneurysms treated with a single craniotomy, 2023, Wits Journal of Clinical Medicine
  • The significance and impact of a rare finding of a right aortic arch during a neuro-endovascular intervention, 2025, 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 include:

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

The work of John H. Ouma has been published in journals such as:

  • 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

  • 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

  • Helminth- and Bacillus Calmette-Guérin-Induced Immunity in Children Sensitized In Utero to Filariasis and Schistosomiasis

    Indu Malhotra;Peter Mungai;Alex Wamachi;John Kioko

  • 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

  • Immunity to schistosomes: progress toward vaccine

    André Capron;J. P. Dessaint;M. Capron;J. H. Ouma

  • Studies on Schistosomiasis in Western Kenya: I. Evidence for Immune-Facilitated Excretion of Schistosome Eggs from Patients with Schistosoma mansoni and Human Immunodeficiency Virus Coinfections

    D. M. S. Karanja;D. G. Colley;B. L. Nahlen;J. H. Ouma

  • Periportal Fibrosis in Human Schistosoma mansoni Infection Is Associated with Low IL-10, Low IFN-γ, High TNF-α, or Low RANTES, Depending on Age and Gender

    Mark Booth;Joseph K. Mwatha;Sarah Joseph;Frances M. Jones

  • Permethrin-impregnated bednet effects on resting and feeding behaviour of lymphatic filariasis vector mosquitoes in Kenya.

    Claus Bøgh;Erling M. Pedersen;Dunstan A. Mukoko;John H. Ouma

  • High levels of TNF, soluble TNF receptors, soluble ICAM-1, and IFN-gamma, but low levels of IL-5, are associated with hepatosplenic disease in human schistosomiasis mansoni

    Joseph K. Mwatha;Gachuhi Kimani;Timothy Kamau;Gabriel G. Mbugua

  • 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

  • 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

  • In utero exposure to helminth and mycobacterial antigens generates cytokine responses similar to that observed in adults.

    Indu Malhotra;John Ouma;Alex Wamachi;John Kioko

  • 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

  • Immunity after treatment of human schistosomiasis: association between cellular responses and resistance to reinfection.

    M. Roberts;A. E. Butterworth;G. Kimani;T. Kamau

  • 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

  • Morbidity in schistosomiasis: an update.

    Birgitte J Vennervald;David W Dunne

  • B Cell Sensitization to Helminthic Infection Develops In Utero in Humans

    Christopher L. King;Indu Malhotra;Peter Mungai;Alex Wamachi

  • Immunity in human schistosomiasis mansoni. Regulation of protective immune mechanisms by IgM blocking antibodies.

    J Khalife;M Capron;A Capron;J M Grzych

  • Spatial patterns of urinary schistosomiasis infection in a highly endemic area of coastal Kenya.

    Julie A. Clennon;Charles Harding King;Eric M. Muchiri;H. Curtis Kariuki

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

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

Frequent Co-Authors

David W. Dunne
David W. Dunne University of Cambridge
Birgitte J. Vennervald
Birgitte J. Vennervald University of Copenhagen
Eric M. Muchiri
Eric M. Muchiri Case Western Reserve University
Anthony E. Butterworth
Anthony E. Butterworth University of Cambridge
Christopher L. King
Christopher L. King Case Western Reserve University
Charles H. King
Charles H. King Case Western Reserve University
Narcis B. Kabatereine
Narcis B. Kabatereine Imperial College London
Robert W. Snow
Robert W. Snow Kenya Medical Research Institute
James W. Kazura
James W. Kazura Case Western Reserve University
John C. Beier
John C. Beier University of Miami

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