Spatial analysis of sleeping sickness, southeastern Uganda, 1970-2003

Area of Science:

• Epidemiology
• Public Health
• Disease Ecology

Background:

• Human African Trypanosomiasis (HAT), or sleeping sickness, resurged in southeastern Uganda in the 1970s.
• The disease's northward expansion into new districts indicates ongoing transmission and presents a persistent public health challenge.
• Understanding the drivers of sleeping sickness spread and distribution is crucial for effective control strategies.

Purpose of the Study:

• To map the spatiotemporal distribution and magnitude of sleeping sickness in southeastern Uganda between 1970 and 2003.
• To analyze the patterns and velocity of disease spread over time.
• To identify key areas and trends in the re-emergence and propagation of sleeping sickness.

Main Methods:

• Utilized data from the Ugandan Ministry of Health and sleeping sickness treatment centers.
• Conducted interviews with public health officials to gather comprehensive information.
• Developed incidence maps, performed space-time cluster detection, and created a velocity vector map to visualize disease spread.

Main Results:

• Demonstrated a rapid propagation of sleeping sickness from its origin in southern Iganga District.
• Documented the northward spread of the disease into previously unaffected districts and foci.
• Visualized the dynamic spread patterns, indicating a significant geographical expansion over the study period.

Conclusions:

• Sleeping sickness has shown a dynamic and rapid spread in southeastern Uganda from 1970 to 2003.
• The disease's expansion into new areas underscores its persistent public health significance.
• Further investigation into the factors influencing transmission is necessary for targeted interventions.