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John Ojal
Affiliation : Kenya Medical Research Institute · KEMRI-Wellcome Trust Research Programme
- 32Publications (affiliation in Kenya)
Research profile
John Ojal has 32 indexed publications (2011–2025). Their work appears mainly in “Vaccine”, “BMC Medicine” and “The Lancet Global Health”. Their most cited article, “Profile: The Kilifi Health and Demographic Surveillance System (KHDSS)” (2012), has been cited 367 times. 4 of these publications date from the last three years of activity. Their work is co-authored with at least 12 researchers, including institutions in United Kingdom, Ghana, Nigeria, United States.
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Create my free profile Add my publicationsPublications (32)
- Seroprevalence of Immunoglobulin G against measles and rubella over a 12-year period (2009–2021) in Kilifi, Kenya and the impact of the Measles-Rubella (MR) vaccine campaign of 2016
- A qualitative inquiry on drivers of COVID-19 vaccine hesitancy among adults in Kenya
- The impact of introduction of the 10-valent pneumococcal conjugate vaccine on pneumococcal carriage in Nigeria
- Non-O ABO blood group genotypes differ in their associations with Plasmodium falciparum rosetting and severe malaria
- Epidemiological impact and cost-effectiveness analysis of COVID-19 vaccination in Kenya
- Social mixing patterns relevant to infectious diseases spread by close contact in urban Blantyre, Malawi
- Revealing the extent of the first wave of the COVID-19 pandemic in Kenya based on serological and PCR-test data
- Examining the unit costs of COVID-19 vaccine delivery in Kenya
- The cost of illness for childhood clinical pneumonia and invasive pneumococcal disease in Nigeria
- A computational framework for modelling infectious disease policy based on age and household structure with applications to the COVID-19 pandemic
- COVID-19 transmission dynamics underlying epidemic waves in Kenya
- The importance of supplementary immunisation activities to prevent measles outbreaks during the COVID-19 pandemic in Kenya
- Revealing the extent of the first wave of the COVID-19 pandemic in Kenya based on serological and PCR-test data
- Estimating the contribution of HIV-infected adults to household pneumococcal transmission in South Africa, 2016–2018: A hidden Markov modelling study
- Effect of ten-valent pneumococcal conjugate vaccine on invasive pneumococcal disease and nasopharyngeal carriage in Kenya: a longitudinal surveillance study
- The epidemiology of sickle cell disease in children recruited in infancy in Kilifi, Kenya: a prospective cohort study
- Sustaining pneumococcal vaccination after transitioning from Gavi support: a modelling and cost-effectiveness study in Kenya
- Human candidate gene polymorphisms and risk of severe malaria in children in Kilifi, Kenya: a case-control association study
- The clinical epidemiology of sickle cell anemia In A frica
- Strong Gradients in Forest Sensitivity to Climate Change Revealed by Dynamics of Forest Fire Cycles in the Post Little Ice Age Era
- 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
- 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
- Pneumococcal conjugate vaccine induced IgG and nasopharyngeal carriage of pneumococci: Hyporesponsiveness and immune correlates of protection for carriage
- Under-five mortality rate variation between the Health and Demographic Surveillance System (HDSS) and Demographic and Health Survey (DHS) approaches
- Multiple clinical episodes of Plasmodium falciparum malaria in a low transmission intensity setting: exposure versus immunity
- 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
- 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
- Profile: The Kilifi Health and Demographic Surveillance System (KHDSS)
- Rates of Acquisition of Pneumococcal Colonization and Transmission Probabilities, by Serotype, Among Newborn Infants in Kilifi District, Kenya
- Excess child mortality after discharge from hospital in Kilifi, Kenya: a retrospective cohort analysis
- Pneumococcal Conjugate Vaccine Given Shortly After Birth Stimulates Effective Antibody Concentrations and Primes Immunological Memory for Sustained Infant Protection
- Acute seizures attributable to falciparum malaria in an endemic area on the Kenyan coast
Publication venues
- Vaccine × 3
- BMC Medicine × 3
- The Lancet Global Health × 3
- BMJ Global Health × 2
- Wellcome Open Research × 2
- PLoS Computational Biology × 2
Publications per year
- 20251
- 20241
- 20232
- 20226
- 20214
- 20193
- 20181
- 20175
- 20161
- 20151
Collaborations
Partner institutions : University of Oxford · Wellcome Trust · London School of Hygiene & Tropical Medicine · Ministry of Health · Government of Kenya
Co-authors’ countries : United Kingdom · Ghana · Nigeria · United States
Co-authors
- J. Anthony G. Scott
- Ifedayo Adetifa
- Benjamin Tsofa
- Sophie M. Uyoga
- Thomas Neil Williams
- D. James Nokes
- Donald O. Akech
- Kevin Marsh
- Neema Mturi
- Edwine Barasa
- Norbert M. Peshu
- Mark Otiende
Bibliographic data from OpenAlex (open database).
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