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C. Okoyo · SciRah

Researcher profile · Semantic Scholar

C. Okoyo

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C. Okoyo — researcher profile on SciRah

h-index: 18
Works: 83
Citations: 1,001

Most-cited papers

Results of a national school-based deworming programme on soil-transmitted helminths infections and schistosomiasis in Kenya: 2012–2017
C. Mwandawiro, C. Okoyo, J. Kihara, Elses Simiyu +5 more
2019Parasites & Vectors86 citations Open access
Semantic Scholar
Associations between school- and household-level water, sanitation and hygiene conditions and soil-transmitted helminth infection among Kenyan school children
Matthew C Freeman, A. Chard, B. Nikolay, J. Garn +6 more
2015Parasites & Vectors76 citations Open access
Semantic Scholar
Prevalence, intensity and associated risk factors of soil-transmitted helminth and schistosome infections in Kenya: Impact assessment after five rounds of mass drug administration in Kenya
C. Okoyo, S. Campbell, K. Williams, Elses Simiyu +2 more
2020PLoS Neglected Tropical Diseases69 citations Open access
Semantic Scholar
Monitoring the impact of a national school based deworming programme on soil-transmitted helminths in Kenya: the first three years, 2012 – 2014
C. Okoyo, B. Nikolay, J. Kihara, Elses Simiyu +8 more
2016Parasites & Vectors56 citations Open access
Semantic Scholar
Comparing the performance of circulating cathodic antigen and Kato-Katz techniques in evaluating Schistosoma mansoni infection in areas with low prevalence in selected counties of Kenya: a cross-sectional study
C. Okoyo, Elses Simiyu, S. Njenga, C. Mwandawiro
2018BMC Public Health38 citations Open access
Semantic Scholar
Evaluating the impact of larviciding with Bti and community education and mobilization as supplementary integrated vector management interventions for malaria control in Kenya and Ethiopia
C. Mutero, C. Okoyo, M. Girma, J. Mwangangi +6 more
2020Malaria Journal37 citations Open access
Semantic Scholar
Assessment of lymphatic filariasis prior to re-starting mass drug administration campaigns in coastal Kenya
S. Njenga, H. Kanyi, Faith M. Mutungi, C. Okoyo +7 more
2017Parasites & Vectors37 citations Open access
Semantic Scholar
Current status of Schistosoma mansoni and the factors associated with infection two years following mass drug administration programme among primary school children in Mwea irrigation scheme: A cross-sectional study
J. Masaku, N. Madigu, C. Okoyo, S. Njenga
2015BMC Public Health34 citations Open access
Semantic Scholar
Model-Based Geostatistical Methods Enable Efficient Design and Analysis of Prevalence Surveys for Soil-Transmitted Helminth Infection and Other Neglected Tropical Diseases
Olatunji Johnson, C. Fronterrè, B. Amoah, A. Montresor +10 more
2021Clinical Infectious Diseases33 citations Open access
Semantic Scholar
Assessment of malaria infection among pregnant women and children below five years of age attending rural health facilities of Kenya: A cross-sectional survey in two counties of Kenya
C. Okoyo, E. Githinji, R. Muia, J. Masaku +5 more
2021PLoS ONE33 citations Open access
Semantic Scholar
High prevalence of helminths infection and associated risk factors among adults living in a rural setting, central Kenya: a cross-sectional study
J. Masaku, Faith M. Mutungi, P. Gichuki, C. Okoyo +2 more
2017Tropical Medicine and Health33 citations Open access
Semantic Scholar
Understanding Heterogeneity in the Impact of National Neglected Tropical Disease Control Programmes: Evidence from School-Based Deworming in Kenya
B. Nikolay, C. Mwandawiro, J. Kihara, C. Okoyo +13 more
2015PLoS Neglected Tropical Diseases33 citations Open access
Semantic Scholar
Current Status of Soil-Transmitted Helminths among School Children in Kakamega County, Western Kenya
T. Ngonjo, C. Okoyo, Julius Andove, Elses Simiyu +4 more
2016Journal of Parasitology Research32 citations Open access
Semantic Scholar
Evaluating effectiveness of screening house eaves as a potential intervention for reducing indoor vector densities and malaria prevalence in Nyabondo, western Kenya
P. Ng'ang'a, C. Okoyo, C. Mbogo, C. Mutero
2020Malaria Journal30 citations Open access
Semantic Scholar
Comparing insecticide-treated bed net use to Plasmodium falciparum infection among schoolchildren living near Lake Victoria, Kenya
C. Okoyo, C. Mwandawiro, J. Kihara, Elses Simiyu +4 more
2015Malaria Journal25 citations Open access
Semantic Scholar
Prevalence of Intestinal Parasitic Infections and Associated Water, Sanitation, and Hygiene Risk Factors among School Children in Mwea Irrigation Scheme, Kirinyaga County, Kenya
Elizabeth Njambi, D. Magu, J. Masaku, C. Okoyo +1 more
2020Journal of Tropical Medicine23 citations Open access
Semantic Scholar
Targeted Amplicon Deep Sequencing for Monitoring Antimalarial Resistance Markers in Western Kenya
Victor Osoti, M. Akinyi, K. Wamae, K. Kimenyi +10 more
2022Antimicrobial Agents and Chemotherapy21 citations Open access
Semantic Scholar
Soil-transmitted helminths and schistosomiasis among pre-school age children in a rural setting of Busia County, Western Kenya: a cross-sectional study of prevalence, and associated exposures
J. Masaku, D. Njomo, A. Njoka, C. Okoyo +2 more
2020BMC Public Health21 citations Open access
Semantic Scholar
Schistosomiasis, soil transmitted helminthiasis, and malaria co-infections among women of reproductive age in rural communities of Kwale County, coastal Kenya
V. Jeza, Francis M. Mutuku, L. Kaduka, C. Mwandawiro +6 more
2022BMC Public Health18 citations Open access
Semantic Scholar
Implementation challenges and opportunities for improved mass treatment uptake for lymphatic filariasis elimination: Perceptions and experiences of community drug distributors of coastal Kenya
D. Njomo, B. Kimani, L. Kibe, C. Okoyo +2 more
2020PLoS Neglected Tropical Diseases18 citations Open access
Semantic Scholar
Addressing barriers of community participation and access to mass drug administration for lymphatic filariasis elimination in Coastal Kenya using a participatory approach
D. Njomo, L. Kibe, B. Kimani, C. Okoyo +2 more
2020PLoS Neglected Tropical Diseases16 citations Open access
Semantic Scholar
Detection of low frequency artemisinin resistance mutations, C469Y, P553L and A675V, and fixed antifolate resistance mutations in asymptomatic primary school children in Kenya
Victor Osoti, K. Wamae, L. Ndwiga, P. Gichuki +10 more
2025BMC Infectious Diseases15 citations Open access
Semantic Scholar
Statistical Regression Model of Water, Sanitation, and Hygiene; Treatment Coverage; and Environmental Influences on School-Level Soil-Transmitted Helminths and Schistosome Prevalence in Kenya: Secondary Analysis of the National Deworming Program Data
C. Okoyo, S. Campbell, C. Owaga, N. Onyango +2 more
2021American Journal of Tropical Medicine and Hygiene15 citations Open access
Semantic Scholar
Ascaris lumbricoides Infection Following School-Based Deworming in Western Kenya: Assessing the Role of Pupils' School and Home Water, Sanitation, and Hygiene Exposures
J. Garn, C. Mwandawiro, B. Nikolay, C. Drews-Botsch +5 more
2016American Journal of Tropical Medicine and Hygiene14 citations Open access
Semantic Scholar
Comparison of quantitative polymerase chain reaction, Kato-Katz and circulating cathodic antigen rapid test for the diagnosis of Schistosoma mansoni infection: A cross-sectional study in Kirinyaga County, Kenya
B. Chieng, C. Okoyo, Elses Simiyu, P. Gichuki +4 more
2021Current Research in Parasitology and Vector-Borne Diseases12 citations Open access
Semantic Scholar
Modeling the Interruption of the Transmission of Soil-Transmitted Helminths Infections in Kenya: Modeling Deworming, Water, and Sanitation Impacts
C. Okoyo, G. Medley, C. Mwandawiro, N. Onyango
2021Frontiers in Public Health12 citations Open access
Semantic Scholar
Exploring smallholder farmers’ access and participation in the Home Grown School Feeding Programme in selected counties of Kenya
Joyce Kamau, C. Okoyo, Tabitha Kanyui, Charles Mwandawiro +2 more
2025Frontiers in Public Health10 citations Open access
Semantic Scholar
Model-based geostatistical design and analysis of prevalence for soil-transmitted helminths in Kenya: Results from ten-years of the Kenya national school-based deworming programme
C. Okoyo, M. Minnery, Idah Orowe, C. Owaga +11 more
2023Heliyon10 citations Open access
Semantic Scholar
Prevalence, types, patterns and risk factors associated with drugs and substances of use and abuse: A cross-sectional study of selected counties in Kenya
C. Okoyo, Elizabeth Njambi, V. Were, S. Araka +5 more
2022PLoS ONE9 citations Open access
Semantic Scholar
Intestinal Parasite Infections and Associated Risk Factors among Pre-School Aged Children in Kibera Informal Settlement, Nairobi, Kenya
Daniel Njenga, Amos K. Mbugua, C. Okoyo, S. Njenga
2022East African Health Research Journal9 citations Open access
Semantic Scholar
Mapping of Podoconiosis Cases and Risk Factors in Kenya: A Nationwide Cross-sectional Study.
H. Sultani, C. Okoyo, H. Kanyi, S. Njenga +8 more
2021American Journal of Tropical Medicine and Hygiene9 citations Open access
Semantic Scholar
Triple-drug therapy with ivermectin, diethylcarbamazine and albendazole for the acceleration of lymphatic filariasis elimination in Kenya: Programmatic implementation and results of the first impact assessment
S. Njenga, H. Kanyi, C. Okoyo, E. Githinji +7 more
2024PLoS Neglected Tropical Diseases8 citations Open access
Semantic Scholar
Epidemiology of soil-transmitted helminthiasis among school-aged children in pastoralist communities of Kenya: A cross-sectional study
R. Kihoro, Damaris Mulewa, C. Okoyo, Dominic Ayaa +4 more
2024PLoS ONE8 citations Open access
Semantic Scholar
Prevalence and Correlation Analysis of Soil-Transmitted Helminths Infections and Treatment Coverage for Preschool and School Aged Children in Kenya: Secondary Analysis of the National School Based Deworming Program Data
C. Okoyo, S. Campbell, M. Minnery, C. Owaga +3 more
2021Frontiers in Public Health8 citations Open access
Semantic Scholar
Associations between school- and household-level water, sanitation and hygiene conditions and soil-transmitted helminth infection among Kenyan school children
M. C. Freeman, A. Chard, B. Nikolay, J. Garn +6 more
2015Parasites & Vectors8 citations Open access
Semantic Scholar
Using community-based participatory approaches to improve access to mass drug administration for trachoma elimination in a pastoral conflict area of Kenya
P. Gichuki, B. Kimani, Tabitha Kanyui, C. Okoyo +3 more
2024PLoS Neglected Tropical Diseases7 citations
Semantic Scholar
Understanding factors responsible for the slow decline of soil-transmitted helminthiasis following seven rounds of annual mass drug administration (2012–2018) among school children in endemic counties of Kenya: A mixed method study
J. Masaku, C. Okoyo, S. Araka, Rosemary M Musuva +4 more
2023PLoS Neglected Tropical Diseases7 citations Open access
Semantic Scholar
Genetic diversity of Aedes aegypti populations from Kisumu and Busia counties, western Kenya, and their vector competence for chikungunya virus
Victor O. Anyango, Solomon K. Langat, F. Mulwa, J. Mutisya +8 more
2025PLoS ONE6 citations Open access
Semantic Scholar
Challenges, Opportunities, and Strategies for Addressing Drugs and Substance Abuse in Selected Counties in Kenya
Mariam Macharia, J. Masaku, H. Kanyi, S. Araka +4 more
20226 citations
Semantic Scholar
Spatial variation and clustering of anaemia prevalence in school-aged children in Western Kenya
Bibian N. Robert, Anitah Cherono, Eda Mumo, C. Mwandawiro +5 more
2023PLoS ONE5 citations Open access
Semantic Scholar
Geostatistical modelling of the distribution, risk and burden of podoconiosis in Kenya
K. Deribe, H. Sultani, C. Okoyo, W. Omondi +3 more
2022Transactions of the Royal Society of Tropical Medicine and Hygiene5 citations Open access
Semantic Scholar
Assessment of Soil-Transmitted Helminth Infections among Pregnant Women in Western Kenya: A Cross-Sectional Study
S. Araka, J. Masaku, B. Kimani, Elses Simiyu +3 more
2022East African Journal of Health and Science5 citations Open access
Semantic Scholar
Serial cross-sectional school surveys identifies C469Y, P553L, R561H and A675V kelch 13 mutations associated with artemisinin resistance in Western Kenya
Victor Osoti, K. Wamae, Moses M. Musau, John Magudha +13 more
2025Scientific Reports4 citations Open access
Semantic Scholar
Sensitivity Analysis of a Transmission Interruption Model for the Soil-Transmitted Helminth Infections in Kenya
C. Okoyo, N. Onyango, Idah Orowe, C. Mwandawiro +1 more
2022Frontiers in Public Health4 citations Open access
Semantic Scholar
Assessment of a decentralization model in improving treatment and care of visceral leishmaniasis in Turkana County, Kenya: A mixed method study
J. Mbui, Mariam Macharia, Dawn Maranga, C. Okoyo
2025PLoS ONE3 citations Open access
Semantic Scholar
Mass drug administration for trachoma elimination in a pastoral conflict area in Baringo County, Kenya: A study on barriers to coverage and compliance
B. Kimani, Tabitha Kanyui, P. Gichuki, C. Okoyo +3 more
2025PLoS Neglected Tropical Diseases3 citations Open access
Semantic Scholar
Prevalence and predictors of anemia among six-week-old infants in Kwale County, Kenya: A cross-sectional study
Joyce Mwakishalua, Simon Karanja, Raphael W Lihana, C. Okoyo +2 more
2024PLOS Global Public Health3 citations Open access
Semantic Scholar
Understanding the impact of covariates on the classification of implementation units for soil-transmitted helminths control: a case study from Kenya
A. Puranik, P. Diggle, M. Odiere, Katie Gass +7 more
2024BMC Medical Research Methodology3 citations Open access
Semantic Scholar
Using a model-based geostatistical approach to design and analyse the prevalence of schistosomiasis in Kenya
C. Okoyo, M. Minnery, Idah Orowe, C. Owaga +10 more
2023Frontiers in Tropical Diseases3 citations Open access
Semantic Scholar
Towards elimination of Lymphatic Filariasis in Kenya: improving advocacy, communication and social mobilization activities for mass drug administration, a qualitative study
L. Kibe, B. Kimani, C. Okoyo, W. Omondi +2 more
2021Tropical Diseases, Travel Medicine and Vaccines3 citations Open access
Semantic Scholar

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C. Mwandawiro×24
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D. Njomo×11
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J. Masaku×10
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Elses Simiyu×9

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H. Kanyi — researcher profile on SciRah

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H. Sultani — researcher profile on SciRah

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S. Kepha — researcher profile on SciRah

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S. Brooker — researcher profile on SciRah