A Multiscale Model for the World's First Parasitic Disease Targeted for Eradication: Guinea Worm Disease

Area of Science:

• * One Health
• * Epidemiology
• * Parasitology

Background:

• * Guinea worm disease (GWD) is a neglected tropical disease exacerbated by environmental factors and climate change.
• * Infectious diseases pose significant threats to human welfare, particularly in developing nations.
• * Understanding the complex interactions between hosts, parasites, and vectors is crucial for disease control.

Purpose of the Study:

• * To develop and analyze a multiscale model of Guinea worm disease (GWD) transmission.
• * To examine the interactions between the human host, the Dracunculus medinensis parasite, and the copepod vector.
• * To identify key epidemiological roles and effective elimination strategies for GWD.

Main Methods:

• * Development of a multiscale mathematical model integrating within-host and between-host transmission dynamics.
• * Sensitivity analysis of the basic reproduction number (R₀) to identify critical factors in GWD transmission.
• * Concurrent examination of the roles of the human host, parasite, and copepod vector.

Main Results:

• * The most effective strategy for GWD elimination at the between-host scale is prioritizing copepod vector control through chemical treatment of drinking water.
• * Health education promoting behavioral changes, such as voluntary case reporting and safe water consumption, is essential.
• * Interventions targeting the within-host scale, specifically a drug to kill female worms, would have a substantial impact on reducing morbidity and transmission.

Conclusions:

• * Integrated multiscale modeling provides critical insights into GWD transmission dynamics.
• * A dual approach combining environmental control (copepod eradication) and behavioral interventions is most efficient for GWD elimination.
• * Developing a within-host therapeutic intervention holds significant potential for population-level benefits in GWD control.