Molecular prevalence of Trypanosoma spp. in wild rodents of Southeast Asia: influence of human settlement habitat

Pumhom Pornpan, Pognon Damien, Yangtara Sarawut, Tharrathorn N., Milocco Cristina, Douangboupha Bounneuang, Herder Stéphane, Chaval Yannick, Morand Serge, Jittapalapong Sathaporn, Desquesnes Marc. 2014. Molecular prevalence of Trypanosoma spp. in wild rodents of Southeast Asia: influence of human settlement habitat. Epidemiology and Infection, 142 (6) : pp. 1221-1230.

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Abstract : This study investigated the molecular prevalence of Trypanosoma lewisi and T. evansi in wild rodents from Cambodia, Lao PDR and Thailand. Between 2008 and 2012, rodents (and shrews) were trapped in nine locations and 616 of these were tested using three sets of primers: TRYP1 (amplifying ITS1 of ribosomal DNA of all trypanosomes), TBR (amplifying satellite genomic DNA of Trypanozoon parasites) and LEW1 (amplifying ITS1 of ribosomal DNA of T. lewisi). Based on the size of the PCR products using TRYP1, 17% were positive for T. lewisi and 1·0% positive for Trypanozoon. Results were confirmed by sequencing PCR products and by using more specific primers (LEW1 and TBR). The specificity of TRYP1 primers, however, failed as rodent DNA was amplified in some instances, giving unexpected product sizes. Using LEW1 primers, 13·3% of the samples were confirmed positive for T. lewisi, both by PCR and sequencing. In Thailand, T. lewisi was found in Rattus tanezumi, R. exulans and Berylmys; in Lao PDR, in R. tanezumi and R. exulans, and in Cambodia in R. tanezumi, R. exulans and R. norvegicus. Using TBR, 1·3% of the samples tested positive for Trypanozoon by PCR and sequencing; T. evansi is the only species of the Trypanozoon subgenus possibly present in wild Asian rodents. These results confirmed its presence in rodents from Thailand (R. tanezumi), Lao PDR (R. tanezumi, R. nitidus) and Cambodia (R. tanezumi, Niviventer fulvescens, Maxomys surifer). Based on the information related to rodent trapping, it was found that rodent species trapped in and around human dwellings had a higher prevalence of T. lewisi infection. R. tanezumi and R. exulans, two synanthropic species, were mainly found infected in this habitat suggesting a role as a reservoir and thus a potential source of T. lewisi for human infection. (Résumé d'auteur)

Mots-clés Agrovoc : Trypanosoma lewisi, Trypanosoma evansi, Transmission des maladies, Santé publique, Maladie de l'homme, Musaraigne, Rongeur, Animal sauvage, Écologie animale, habitat, Enquête organismes nuisibles, Piégeage des animaux, Biologie moléculaire, Identification

Mots-clés géographiques Agrovoc : République démocratique populaire lao, Thaïlande, Cambodge, Asie du Sud-Est

Classification Agris : L72 - Pests of animals
L73 - Animal diseases

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

Auteurs et affiliations

  • Pumhom Pornpan, Kasetsart University (THA)
  • Pognon Damien, CIRAD-ES-UMR SELMET (REU)
  • Yangtara Sarawut, Kasetsart University (THA)
  • Tharrathorn N., Kasetsart University (THA)
  • Milocco Cristina, Kasetsart University (THA)
  • Douangboupha Bounneuang, NAFRI (LAO)
  • Herder Stéphane, IRD (FRA)
  • Chaval Yannick, INRA (FRA)
  • Morand Serge, CIRAD-ES-UPR AGIRs (LAO) ORCID: 0000-0003-3986-7659
  • Jittapalapong Sathaporn, Kasetsart University (THA)
  • Desquesnes Marc, CIRAD-BIOS-UMR INTERTRYP (THA) ORCID: 0000-0002-7665-2422

Source : Cirad - Agritrop (

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