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Interactions between climatic changes and intervention effects on malaria spatio-temporal dynamics in Uganda.
Julius Ssempiira1,2,3, John Kissa4, Betty Nambuusi1,2,3
1Swiss Tropical and Public Health Institute, Socinstrasse 57, 4051 Basel, Switzerland.
Parasite Epidemiology and Control
|July 11, 2018
Summary
Climate change in Uganda is worsening malaria transmission, impacting intervention effectiveness. Developing a Malaria Early Warning System is crucial to mitigate these adverse effects and protect public health.
Area of Science:
- Epidemiology
- Environmental Science
- Public Health
Background:
- Malaria remains a leading cause of death and hospitalization in Uganda despite intervention efforts.
- High malaria transmission is linked to favorable weather conditions, raising concerns about climate change impacts.
- This study examines the influence of climate on malaria incidence trends in Uganda from 2013 to 2017.
Purpose of the Study:
- To investigate the spatio-temporal relationship between climate variables and malaria incidence in Uganda.
- To assess how climate changes between 2013 and 2017 affected malaria trends.
- To understand the interplay between climate, interventions, and malaria transmission.
Main Methods:
- Bayesian spatio-temporal negative binomial models were used for district-aggregated monthly malaria cases.
- Remote sensing data (rainfall, LSTD, LSTN, NDVI) and geographical factors were analyzed.
- Fourier functions modeled seasonality, while autoregressive processes accounted for spatial and temporal correlations.
Main Results:
- Malaria incidence declined until 2015, then rose in 2016, with significant decreases in children under 5.
- Increased rainfall, LSTD, LSTN, and decreased NDVI correlated with reduced incidence decline.
- Interventions and healthcare-seeking behavior showed stronger effects than climate, with notable interactions between interventions and climate variables.
Conclusions:
- Climate change has created a more favorable environment for malaria transmission in Uganda.
- Adverse climatic effects have diminished the gains from malaria control interventions.
- Collaboration between health and meteorological authorities is recommended for a Malaria Early Warning System.
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