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OA-011
THE IMMUNE TRYPANOLYSIS TEST: AN ACCURATE SEROLOGICAL MARKER TO MANAGE ELIMINATION OF T.B. GAMBIENSE HUMAN AFRICAN TRYPANOSOMIASIS
  1. Dama Emilie1,2,
  2. Oumou Camara3,
  3. Koffi Mathurin4,
  4. Dayo Guiguigbaza-Kossigan2,
  5. Büscher Philippe5,
  6. Fikru Regassa6,
  7. Sakande Hassane2,
  8. Somda Martin Bienvenu1,2,
  9. Hamidou Ilboudo2,
  10. Courtin Fabrice7,
  11. Elie Ouédraogo8,
  12. Lingue Kouakou9,
  13. Dramane Kaba10,
  14. Mamady Camara4,
  15. Bruno Bucheton7,
  16. Veerle Lejon7,
  17. Vincent Jamonneau7
  1. 1UPB, Bobo-Dioulasso, Burkina Faso
  2. 2CIRDES, Burkina Faso
  3. 3PNLTHA, Guinea
  4. 4UJILOG (LIHME), Côte d'Ivoire
  5. 5ITM, Antwerp, Belgium
  6. 6CVMA (Addis Ababa University), Ethiopia
  7. 7IRD (UMR177 IRD-CIRAD, TA A-17/G), France
  8. 8DLM, Burkina Faso
  9. 9PNETHA, Côte d'Ivoire
  10. 10Institut Pierre Richet, Côte d'Ivoire

Abstract

Background Continued post-elimination monitoring is required to ensure sustainability of zero transmission of human African trypanosomosis (HAT) and to avoid re-emergence caused by potential remaining Trypanosoma brucei gambiense reservoirs (animal and/or human). Until now, no tool is able to attest or validate elimination. Increasingly, the serological immune trypanolysis test is being implemented in the decision algorithms to characterise parasitological unconfirmed CATT or RDT seropositive subjects. Therefore, we wanted to assess further the high specificity of immune trypanolysis.

Methods We first tested samples from domestic animals from a tsetse-infested area in Ethiopia, a country where no T. b. gambiense exists, but where bovine trypanosomosis is prevalent. Then, we tested cattle and human samples from the south-west of Burkina Faso, a historical focus of gambiense HAT that still shelters tsetse flies populations and animal trypanosomosis. Lastly, we were interested in testing human samples from active foci in Côte d'Ivoire and Guinea.

Results Our results showed zero trypanolysis-positive animals from Ethiopia while in the historical HAT foci in Burkina Faso, 4.89% (14/286) of cattle were trypanolysis-positive. In humans, zero samples over 729 were trypanolysis-positive in Burkina Faso, while the percentage of positives was 3.77% (44/1166) in Guinea, including 7 new cases diagnosed during the sampling and 1.3% in Côte d'Ivoire (8/598).

Conclusions Considering results from this study, we think that trypanolysis test, confirmed to be a very specific test in human, can be a tool able to certify HAT elimination in a given area. It also suggests that the risk of the reintroduction of T. b. gambiense in Burkina Faso is real, especially in the south-west which shelters a high density of tsetse populations, in addition to the possible presence of T. b. gambiense in domestic animals. However, further studies on the specificity of the trypanolysis test regarding T. b. gambiense in animals should be conducted.

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