Zoonotic trypanosomes in South East Asia: attempts to control Trypanosoma lewisi using human and animal trypanocidal drugs

Desquesnes Marc, Yangtara Sarawut, Kunphukhieo Pawinee, Jittapalapong Sathaporn, Herder Stéphane. 2016. Zoonotic trypanosomes in South East Asia: attempts to control Trypanosoma lewisi using human and animal trypanocidal drugs. Infection, Genetics and Evolution, 44 : pp. 514-521.

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Quartile : Q2, Sujet : INFECTIOUS DISEASES

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Anthropologie-Ethnologie

Abstract : Beside typical human trypanosomes responsible of sleeping sickness in Africa and Chagas disease in Latin America, there is a growing number of reported atypical human infections due to Trypanosoma evansi, a livestock parasite, or Trypanosoma lewisi, a rat parasite, especially in Asia. Drugs available for the treatment of T. brucei ssp. in humans are obviously of choice for the control of T. evansi because it is derived from T. brucei. However, concerning T. lewisi, there is an urgent need to determine the efficacy of trypanocidal drugs for the treatment in humans. In a recent study, pentamidine and fexinidazole were shown to have the best efficacy against one stock of T. lewisi in rats. In the present study suramin, pentamidine, eflornitine, nifurtimox, benznidazole and fexinidazole, were evaluated at low and high doses, in single day administration to normal rats experimentally infected with a stock of T. lewisi recently isolated in Thailand. Because none of these treatments was efficient, a trial was made with the most promising trypanocide identified in a previous study, fexinidazole 100 mg/kg, in 5 daily administrations. Results observed were unclear. To confirm the efficacy of fexinidazole, a mixed infection protocol was set up in cyclophosphamide immunosuppressed rats. Animals were infected successively by T. lewisi and T. evansi, and received 10 daily PO administrations of 200 mg/kg fexinidazole. Drastic effects were observed against T. evansi which was cleared from the rat's blood within 24 to 48 h; however, the treatment did not affect T. lewisi which remained in high number in the blood until the end of the experiment. This mixed infection/treatment protocol clearly demonstrated the efficacy of fexinidazole against T. evansi and its inefficacy against T. lewisi. Since animal trypanocides were also recently shown to be inefficient, other protocols as well as other T. lewisi stocks should be investigated in further studies. (Résumé d'auteur)

Mots-clés Agrovoc : zoonose, Trypanosoma lewisi, Trypanosoma evansi, Contrôle de maladies, Genre humain, Maladie de l'homme, Rat, Médicament, Efficacité d'utilisation

Mots-clés géographiques Agrovoc : Asie du Sud-Est

Classification Agris : 000 - Other themes
L72 - Pests of animals
L73 - Animal diseases

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

Auteurs et affiliations

  • Desquesnes Marc, CIRAD-BIOS-UMR INTERTRYP (THA) ORCID: 0000-0002-7665-2422
  • Yangtara Sarawut, Kasetsart University (THA)
  • Kunphukhieo Pawinee, Kasetsart University (THA)
  • Jittapalapong Sathaporn, Kasetsart University (THA)
  • Herder Stéphane, IRD (FRA)

Source : Cirad-Agritrop (

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