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Author

John Ojal

Observed names: J Ojal, J. Ojal, John. Ojal, Ojal, J., Ojal, John
ORCID: 0000-0002-3010-1158
Observed ORCID: 0000-0002-3010-1158
OpenAlex ID: A5003592255
Profile: The Kilifi Health and Demographic Surveillance System (KHDSS)
2012 · J. A. G. Scott, E. Bauni, et al. · International Journal of Epidemiology · 366
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Effect of ten-valent pneumococcal conjugate vaccine on invasive pneumococcal disease and nasopharyngeal carriage in Kenya: a longitudinal surveillance study
2019 · Laura L Hammitt, Anthony O Etyang, et al. · The Lancet · 155
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The epidemiology of sickle cell disease in children recruited in infancy in Kilifi, Kenya: a prospective cohort study
2019 · Sophie Uyoga, Alex W Macharia, et al. · The Lancet Global Health · 112
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Human candidate gene polymorphisms and risk of severe malaria in children in Kilifi, Kenya: a case-control association study
2018 · Carolyne M Ndila, Sophie Uyoga, et al. · The Lancet Haematology · 108
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Excess child mortality after discharge from hospital in Kilifi, Kenya: a retrospective cohort analysis
2011 · Jennifer Moïsi, Hellen Gatakaa, et al. · Bulletin of the World Health Organization · 91
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COVID-19 transmission dynamics underlying epidemic waves in Kenya
2021 · Samuel P. C. Brand, John Ojal, et al. · Science · 90
The INDEPTH standard population for low- and middle-income countries, 2013
2014 · Osman Sankoh, David Sharrow, et al. · Global Health Action · 83
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The clinical epidemiology of sickle cell anemia In A frica
2017 · Alex W. Macharia, George Mochamah, et al. · American Journal of Hematology · 67
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Rates of Acquisition of Pneumococcal Colonization and Transmission Probabilities, by Serotype, Among Newborn Infants in Kilifi District, Kenya
2012 · C. C. Tigoi, H. Gatakaa, et al. · Clinical Infectious Diseases · 64
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Pneumococcal Conjugate Vaccine Given Shortly After Birth Stimulates Effective Antibody Concentrations and Primes Immunological Memory for Sustained Infant Protection
2011 · J. Anthony G. Scott, John Ojal, et al. · Clinical Infectious Diseases · 62
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Burden of disease in adults admitted to hospital in a rural region of coastal Kenya: an analysis of data from linked clinical and demographic surveillance systems
2014 · Anthony O Etyang, Kenneth Munge, et al. · The Lancet Global Health · 61
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Acute seizures attributable to falciparum malaria in an endemic area on the Kenyan coast
2011 · Symon M. Kariuki, Michelle Ikumi, et al. · Brain · 47
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Estimating the contribution of different age strata to vaccine serotype pneumococcal transmission in the pre vaccine era: a modelling study
2020 · Stefan Flasche, Marc Lipsitch, et al. · BMC Medicine · 46
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Strong Gradients in Forest Sensitivity to Climate Change Revealed by Dynamics of Forest Fire Cycles in the Post Little Ice Age Era
2017 · Igor Drobyshev, Yves Bergeron, et al. · Journal of Geophysical Research Biogeosciences · 43
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Epidemiological impact and cost-effectiveness analysis of COVID-19 vaccination in Kenya
2022 · Stacey Orangi, John Ojal, et al. · BMJ Global Health · 40
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Assessing the efficiency of catch-up campaigns for the introduction of pneumococcal conjugate vaccine: a modelling study based on data from PCV10 introduction in Kilifi, Kenya
2017 · Stefan Flasche, John Ojal, et al. · BMC Medicine · 37
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Immunogenicity, Impact on Carriage and Reactogenicity of 10-Valent Pneumococcal Non-Typeable Haemophilus influenzae Protein D Conjugate Vaccine in Kenyan Children Aged 1–4 Years: A Randomized Controlled Trial
2014 · Laura L. Hammitt, John Ojal, et al. · PLoS ONE · 36
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Social mixing patterns relevant to infectious diseases spread by close contact in urban Blantyre, Malawi
2022 · Deus Thindwa, Kondwani C. Jambo, et al. · Epidemics · 32
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Multiple clinical episodes of Plasmodium falciparum malaria in a low transmission intensity setting: exposure versus immunity
2015 · Josea Rono, Anna Färnert, et al. · BMC Medicine · 28
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Sustaining pneumococcal vaccination after transitioning from Gavi support: a modelling and cost-effectiveness study in Kenya
2019 · John Ojal, Ulla Griffiths, et al. · The Lancet Global Health · 27
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The importance of supplementary immunisation activities to prevent measles outbreaks during the COVID-19 pandemic in Kenya
2021 · CN Mburu, J Ojal, et al. · BMC Medicine · 26
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Pneumococcal conjugate vaccine induced IgG and nasopharyngeal carriage of pneumococci: Hyporesponsiveness and immune correlates of protection for carriage
2017 · John Ojal, Laura L. Hammitt, et al. · Vaccine · 25
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Sustained reduction in vaccine-type invasive pneumococcal disease despite waning effects of a catch-up campaign in Kilifi, Kenya: A mathematical model based on pre-vaccination data
2017 · John Ojal, Stefan Flasche, et al. · Vaccine · 25
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Revealing the extent of the first wave of the COVID-19 pandemic in Kenya based on serological and PCR-test data
2022 · John Ojal, Samuel P. C. Brand, et al. · Wellcome Open Research · 23
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A qualitative inquiry on drivers of COVID-19 vaccine hesitancy among adults in Kenya
2024 · Stacey Orangi, Daniel Mbuthia, et al. · PLOS Global Public Health · 22
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Works count: 77
Citation count: 1,910
H-index: 23
I10-index: 34
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