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Gonzalez-Ittig R.E.,National University of Cordoba | Rivera P.C.,National University of Cordoba | Levis S.C.,Instituto Nacional Of Enfermedades Virales Humanas Inevh | Calderon G.E.,Instituto Nacional Of Enfermedades Virales Humanas Inevh | Gardenal C.N.,National University of Cordoba
Zoological Journal of the Linnean Society | Year: 2014

Several species of the genus Oligoryzomys are natural hosts of different hantavirus genotypes affecting humans. The systematics of the genus is confusing, which complicates the identification of the rodent host and hence the potential endemic areas of hantavirus pulmonary syndrome. In this study, we analyse molecular data to infer phylogenetic relationships among Central and South American specimens of Oligoryzomys, and compare our results with previously published data on karyotypic, geographic distribution and host-virus associations to solve contradictory taxonomic reports. We identified 25 clades, each one corresponding to a different putative species. The phylogenetic trees show that Oligoryzomys longicaudatus is strongly related to the Oligoryzomys flavescens complex, which comprises four clades; Oligoryzomys nigripes is related to Oligoryzomys stramineus, Oligoryzomys vegetus is related to Oligoryzomys fulvescens from Central America, and Oligoryzomys brendae is the sister species of Oligoryzomys aff. destructor. We identified the following rodent host-hantavirus genotype relationships: O.longicaudatus-Andes; O.flavescens 'West'-Bermejo; O.flavescens 'East'-Lechiguanas; O.nigripes-Juquitiba; Oligoryzomys microtis-Rio Mamore and Rio Mamore-3; Oligoryzomys chacoensis-Oran; Oligoryzomys costaricencis-Choclo; Oligoryzomys delicatus-Maporal; Oligoryzomys utiaritensis-Castelo dos Sonhos; Oligoryzomyssp. RT2012-Rio Mamore-4; Oligoryzomyssp. (and not Oligoryzomys fornesi)-Anajatuba. This work, besides contributing to the development of prevention programmes for hantavirus epidemiology in Latin America, represents a comprehensive update of the systematics of the genus Oligoryzomys © 2014 The Linnean Society of London.

Polop F.J.,CONICET | Polop F.J.,National University of Rio Cuarto | Provensal M.C.,National University of Rio Cuarto | Pini N.,Instituto Nacional Of Enfermedades Virales Humanas Inevh | And 7 more authors.
EcoHealth | Year: 2010

Andes virus (AND) is a hantavirus hosted by the sigmodontine rodent Oligoryzomys longicaudatus in southern Argentina, where it is responsible for most cases of hantavirus pulmonary syndrome (HPS). Our study provides data about the spatial variation in abundance of the rodent host of AND hantavirus. We report results of a longitudinal study performed in a locality of the Andean region of Chubut Province. From November 2003 (spring) to July 2006 (winter), O. longicaudatus was the most common species captured (63%) and it showed significant differences in abundance among habitats and seasons. Most antibody-positive rodents were O. longicaudatus (9.2%), followed by A. longipilis (3.6%) and A. olivaceus (1.5%). The highest number of antibody-positive animals was observed for males that belonged to the heaviest mass classes. Antibody-positive O. longicaudatus were more abundant in brush habitats. We found low richness of rodents and abundance of O. longicaudatus in areas affected by anthropogenic activity. The infection seems to be regionally persistent, but the risk to humans in a landscape would be localized. To develop accurate models for predicting HPS outbreaks, further research is needed to characterize rodent movement patterns across the landscape. © 2010 International Association for Ecology and Health.

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