Potential of the oriental house rat, Rattus tanezumi to act as a reservoir of Trypanosoma evansi in Thaïland

Desquesnes Marc, Kocher Arthur, Yangtara Sarawut, Morand Serge, Jittapalapong Sathaporn. 2016. Potential of the oriental house rat, Rattus tanezumi to act as a reservoir of Trypanosoma evansi in Thaïland. In : Abstract book of the first International Conference on Non Tsetse Transmitted Animal Trypanosomosis. OIE, ANSES, Institute of Tropical Medicine Antwerp. Paris : OIE, 30., 1 poster International Conference on Non Tsetse Transmitted Animal Trypanosomosis (NTTAT). 1, Paris, France, 14 Décembre 2016/16 Décembre 2016.

Résumé : Trypanosoma evansi (Steel, 1885) Balbiani, 1888, is a protozoan blood parasite and etiologic agent of “surra,” a disease affecting a wide range of domestic and wild mammals, some identified as potential reservoirs. Although T. evansi has been detected in several small wild rodent species, their role in the epidemiology of surra is unclear. There is molecular evidence of T. evansi in wild rodents in Asia, but it is not known whether they can carry the parasite for sufficient time to significantly contribute to the epidemiology of surra. We assessed the receptivity and susceptibility of the Oriental house rat (OHR; Rattus tanezumi) to T. evansi infection. Five adult male OHRs trapped in Bangkhen district, Bangkok, Thailand, and five laboratory Wistar rats (Rattus norvegicus), as positive controls, were experimentally infected with a local strain of T. evansi. The five controls and three of the five OHRs were highly susceptible and rapidly exhibited high levels of parasitemia as usually observed in Wistar rats. They died or were euthanized just prior to expected death. Two OHRs presented fluctuating levels of parasitemia, without obvious clinical signs, throughout 40 days of monitoring. These results highlight the moderate susceptibility of some OHRs and their ability to carry the infection for a significant period of time. Along with the molecular evidence of T. evansi in captured OHRs (demonstrated elsewhere), our results bring new information on the potential role of OHRs in the complex epidemiology of surra.

Auteurs et affiliations

• Desquesnes Marc, CIRAD-BIOS-UMR TRYPANOSOMES (THA) ORCID: 0000-0002-7665-2422
• Kocher Arthur, Kasetsart University (THA)
• Yangtara Sarawut, Kasetsart University (THA)
• Morand Serge, UM2 (FRA) ORCID: 0000-0003-3986-7659
• Jittapalapong Sathaporn, Kasetsart University (THA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/591930/)

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