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Human African trypanosomiasis: Epidemiology and control.
E M Fèvre1, K Picozzi, J Jannin
1Centre for Infectious Diseases, Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush, Roslin, Midlothian, EH25 9RG, UK.
Advances in Parasitology
|June 1, 2006
Summary
Human African trypanosomiasis (HAT) presents two distinct diseases caused by Trypanosoma brucei gambiense and T. b. rhodesiense. Understanding their unique epidemiology is crucial for effective sleeping sickness control strategies.
Area of Science:
- Tropical medicine
- Parasitology
- Public health
Background:
- Human African trypanosomiasis (HAT), or sleeping sickness, encompasses two distinct diseases: the Gambian form (T. b. gambiense) and the Rhodesian form (T. b. rhodesiense).
- The Gambian form is a major public health concern in central and western Africa, while the Rhodesian form poses a significant risk in eastern and southern Africa.
- These two parasitic forms exhibit different clinical manifestations and epidemiological characteristics.
Purpose of the Study:
- To delineate the key differences between HAT caused by T. b. gambiense and T. b. rhodesiense.
- To analyze how these differences have influenced historical control efforts and inform contemporary strategies.
- To propose optimal HAT control policies by considering the distinct biology and epidemiology of the parasites.
Main Methods:
- Comparative analysis of disease burden, reservoir hosts, transmission dynamics, diagnostic approaches, treatment regimens, and control measures for both HAT forms.
- Review of historical disease control trends in relation to parasitic differences.
- Evaluation of contemporary treatment and control options based on scientific evidence.
Main Results:
- Significant variations exist in clinical presentation, epidemiology, and geographical distribution between the Gambian and Rhodesian forms of HAT.
- Historical control strategies have been shaped by these differences, necessitating tailored approaches.
- Contemporary control requires a nuanced understanding of each parasite's unique characteristics.
Conclusions:
- Effective control of sleeping sickness necessitates distinct strategies for the Gambian and Rhodesian forms, acknowledging their differing biology and epidemiology.
- Integrated control policies must consider the roles and responsibilities of individuals, governments, and international organizations.
- Addressing the specific challenges posed by each HAT form is essential for disease eradication efforts.