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Spatio-Temporal Bayesian Models for Malaria Risk Using Survey and Health Facility Routine Data in Rwanda

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  • Muhammed Semakula

    (I-BioStat, Hasselt University, 3500 Hasselt, Belgium
    Centre of Excellence in Data Science, Bio-Statistics, College of Business and Economics, University of Rwanda, Kigali 4285, Rwanda
    Rwanda Biomedical Center, Kigali 7162, Rwanda
    KIT Royal Tropical Institute of Amsterdam, 1092 AD Amsterdam, The Netherlands)

  • François Niragire

    (Department of Applied Statistics, University of Rwanda, Kigali 4285, Rwanda)

  • Christel Faes

    (I-BioStat, Hasselt University, 3500 Hasselt, Belgium)

Abstract

Introduction: Malaria is a life-threatening disease ocuring mainly in developing countries. Almost half of the world’s population was at risk of malaria in 2020. Children under five years age are among the population groups at considerably higher risk of contracting malaria and developing severe disease. Most countries use Demographic and Health Survey (DHS) data for health programs and evaluation. However, malaria elimination strategies require a real-time, locally-tailored response based on malaria risk estimates at the lowest administrative levels. In this paper, we propose a two-step modeling framework using survey and routine data to improve estimates of malaria risk incidence in small areas and enable quantifying malaria trends. Methods: To improve estimates, we suggest an alternative approach to modeling malaria relative risk by combining information from survey and routine data through Bayesian spatio-temporal models. We model malaria risk using two steps: (1) fitting a binomial model to the survey data, and (2) extracting fitted values and using them in the Poison model as nonlinear effects in the routine data. We modeled malaria relative risk among under-five-year old children in Rwanda. Results: The estimation of malaria prevalence among children who are under five years old using Rwanda demographic and health survey data for the years 2019–2020 alone showed a higher prevalence in the southwest, central, and northeast of Rwanda than the rest of the country. Combining with routine health facility data, we detected clusters that were undetected based on the survey data alone. The proposed approach enabled spatial and temporal trend effect estimation of relative risk in local/small areas in Rwanda. Conclusions: The findings of this analysis suggest that using DHS combined with routine health services data for active malaria surveillance may provide provide more precise estimates of the malaria burden, which can be used toward malaria elimination targets. We compared findings from geostatistical modeling of malaria prevalence among under-five-year old children using DHS 2019–2020 and findings from malaria relative risk spatio-temporal modeling using both DHS survey 2019–2020 and health facility routine data. The strength of routinely collected data at small scales and high-quality data from the survey contributed to a better understanding of the malaria relative risk at the subnational level in Rwanda.

Suggested Citation

  • Muhammed Semakula & François Niragire & Christel Faes, 2023. "Spatio-Temporal Bayesian Models for Malaria Risk Using Survey and Health Facility Routine Data in Rwanda," IJERPH, MDPI, vol. 20(5), pages 1-14, February.
    • Handle: RePEc:gam:jijerp:v:20:y:2023:i:5:p:4283-:d:1082890
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    References listed on IDEAS

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