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Human African Trypanosomiasis (HAT)

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Neglected Tropical Diseases - Sub-Saharan Africa

Part of the book series: Neglected Tropical Diseases ((NTD))

Abstract

Human African trypanosomiasis (HAT) found only in sub-Saharan Africa is caused by the parasite Trypanosoma brucei which is transmitted by tsetse flies. Only two subspecies of T.brucei are pathogenic for humans: T.b. gambiense and T.b. rhodesiense. HAT is endemic in 36 sub-Saharan countries, and 98 % of all reported HAT cases are due to T. b. gambiense. Sixty-nine million persons in Africa are at risk of HAT. The number of HAT cases reported globally decreased fivefold in the last decade which has encouraged WHO to set a target to eliminate HAT as a public health problem by the year 2020, aiming for zero transmission by the year 2030. Tsetse flies do not lay eggs, but the female fly deposits a single mature larva in humid soil. The larva pupates and emerges as an adult fly 20–80 days later. A female fly produces only three to five larvae during her lifetime that typically lasts for 3 months, making the intrinsic growth rate of tsetse populations rather low. An infected tsetse fly injects the infective form of the parasites into the mammalian host when it feeds. These parasites undergo, and are able to switch, their antigenic variation of their variant surface glycoprotein (VSG) coat, allowing them to escape the host immune response. This phenomenon of antigenic variation makes the development of an effective vaccine unlikely. The disease affects mainly the lymphoid system, heart, lungs and brain manifesting as intermittent fever, general malaise, severe headache, joint pains and muscle aches, pruritus, urticaria or facial oedema. Lymphadenopathy is common with the classical Winterbottom’s sign. Patients with the meningo-encephalitic stage suffer continuous headaches with poor response to painkillers and show more specific neurological signs of the rather typical sleep disturbances. Diagnosis of HAT is a three-step procedure: (i) screening test to identify HAT suspects, (ii) confirmatory parasitological tests and (iii) staging. Treatment is based on the stage of illness, current options being pentamidine, suramin, melarsoprol, eflornithine and the nifurtimox-eflornithine combination therapy (NECT). Two strategies are used for the reduction or interruption of HAT transmission: elimination of the parasite reservoir and vector control. This last decade has seen several breakthroughs in clinical R&D for HAT, bringing new diagnostics and drugs to patient care, but effective and efficient implementation of these new tools in HAT control and proper treatment of patients will require further research.

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Authors and Affiliations

  1. Department of Epidemiology, Institut National de Recherche Biomédicale (INRB), Kinshasa, Democratic Republic of Congo

    Pascal Lutumba

  2. Tropical Medicine Department, Faculty of Medicine, Kinshasa University (UNIKIN), Kinshasa, Democratic Republic of Congo

    Pascal Lutumba

  3. College of Veterinary Medicine, Animal Resources and Biosecurity, Makerere University, Kampala, Uganda

    Enock Matovu

  4. Department of Public Health, Institute of Tropical Medicine–Antwerp, Antwerp, Belgium

    Marleen Boelaert

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  1. Pascal Lutumba
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  2. Enock Matovu
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  3. Marleen Boelaert
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Correspondence to Pascal Lutumba .

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  1. Ofc of Research, Innovation & Dev, University of Ghana, Accra, Ghana

    John Gyapong

  2. Lymphatic Filariasis Support Centre, University of Ghana, Accra, Ghana

    Boakye Boatin

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Lutumba, P., Matovu, E., Boelaert, M. (2016). Human African Trypanosomiasis (HAT). In: Gyapong, J., Boatin, B. (eds) Neglected Tropical Diseases - Sub-Saharan Africa. Neglected Tropical Diseases. Springer, Cham. https://doi.org/10.1007/978-3-319-25471-5_4

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