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In Argentina, one of its main hosts is the sigmodontine rodent <jats:italic>Oligoryzomys flavescens<\/jats:italic>, a widely distributed mouse of the Pampas, Delta and Espinal ecoregions of central\u2010east Argentina. Because the abundance of the reservoir and its proportion in the rodent community affects both virus prevalence and human exposure risk, its estimation throughout its known geographical distribution is of key importance for the design of public health strategies to prevent HPS. The aim of this study was therefore to model the relative abundance of <jats:italic>O.\u00a0flavescens<\/jats:italic> in most of the Pampas ecoregion within Buenos Aires Province, Argentina, where hantavirus pulmonary syndrome is endemic. To do this we used owl\u2010pellet samples collected between 2006 and 2008 from 51 sites distributed throughout most of Buenos Aires province. Mammalian prey in each pellet was identified to the lowest possible taxonomic level by examination of the skulls, dentaries and molars. We modelled the frequency of <jats:italic>O.\u00a0flavescens<\/jats:italic> found in each sample as a function of climatic, environmental, and topographic data of each site. The two best models were applied to a Geo referential Information System to build maps of estimated frequency (as a proxy of relative abundance) within Buenos Aires province. Estimated relative abundance of <jats:italic>O.\u00a0flavescens<\/jats:italic> in Buenos Aires province was significantly associated with annual mean temperature, annual precipitation and presence of freshwater bodies, and varied among sub\u2010regions, with the Inland and Rolling Pampas being the regions with highest frequencies. Knowing in which areas <jats:italic>O.\u00a0flavescens<\/jats:italic> abundance is expected to be higher can be used to concentrate limited sanitary efforts in those areas that are most needed in order to reduce transmission and increase detection.<\/jats:p>","DOI":"10.1111\/zph.12996","type":"journal-article","created":{"date-parts":[[2022,8,29]],"date-time":"2022-08-29T05:39:31Z","timestamp":1661751571000},"page":"13-21","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Modelling relative abundance of <i>Oligoryzomys flavescens<\/i>, an <i>Orthohantavirus<\/i> reservoir, in an endemic hantavirus pulmonary syndrome zone"],"prefix":"10.1111","volume":"70","author":[{"given":"Mar\u00eda Victoria","family":"Vadell","sequence":"first","affiliation":[{"name":"Instituto Nacional de Medicina Tropical (INMeT) \u2010 ANLIS \"Dr. Carlos G Malbr\u00e1n\"  Puerto Iguaz\u00fa Argentina"},{"name":"Consejo Nacional de Investigaciones Cient\u00edficas y T\u00e9cnicas (CONICET)  Buenos Aires Argentina"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carlos Gonz\u00e1lez","family":"Fischer","sequence":"additional","affiliation":[{"name":"Facultad de Ciencias Exactas y Naturales, Instituto de Ecolog\u00eda, Gen\u00e9tica y Evoluci\u00f3n de Buenos Aires (CONICET\u2010UBA) Universidad de Buenos Aires  Buenos Aires Argentina"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2280-1816","authenticated-orcid":false,"given":"Mariano","family":"Codesido","sequence":"additional","affiliation":[{"name":"Facultad de Ciencias Exactas y Naturales, Instituto de Ecolog\u00eda, Gen\u00e9tica y Evoluci\u00f3n de Buenos Aires (CONICET\u2010UBA) Universidad de Buenos Aires  Buenos Aires Argentina"},{"name":"Departamento de Biodiversidad y Biolog\u00eda Experimental, Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires  Buenos Aires Argentina"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"An\u00edbal","family":"Carbajo","sequence":"additional","affiliation":[{"name":"Consejo Nacional de Investigaciones Cient\u00edficas y T\u00e9cnicas (CONICET)  Buenos Aires Argentina"},{"name":"Instituto de Investigaci\u00f3n e Ingenier\u00eda Ambiental Universidad Nacional de San Mart\u00edn  Buenos Aires Argentina"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"David","family":"Bilenca","sequence":"additional","affiliation":[{"name":"Facultad de Ciencias Exactas y Naturales, Instituto de Ecolog\u00eda, Gen\u00e9tica y Evoluci\u00f3n de Buenos Aires (CONICET\u2010UBA) Universidad de Buenos Aires  Buenos Aires Argentina"},{"name":"Departamento de Biodiversidad y Biolog\u00eda Experimental, Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires  Buenos Aires Argentina"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7466-6305","authenticated-orcid":false,"given":"Isabel E.","family":"G\u00f3mez Villafa\u00f1e","sequence":"additional","affiliation":[{"name":"Facultad de Ciencias Exactas y Naturales, Instituto de Ecolog\u00eda, Gen\u00e9tica y Evoluci\u00f3n de Buenos Aires (CONICET\u2010UBA) Universidad de Buenos Aires  Buenos Aires Argentina"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2022,8,28]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/jmv.25446"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.3201\/eid2604.190799"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jksus.2015.10.007"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1442-9993.2008.01889.x"},{"key":"e_1_2_8_6_1","first-page":"39","article-title":"Barn owl pellets: A useful tool for monitoring small mammal communities","volume":"135","author":"Avenant N.","year":"2005","journal-title":"Belgian Journal of Zoology"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.5751\/ES-02481-130206"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1139\/Z10-011"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1076\/snfe.38.1.1.14030"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.4269\/ajtmh.1998.59.445"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1515\/mamm.1992.56.1.45"},{"key":"e_1_2_8_12_1","first-page":"5","article-title":"Argentina y el cambio clim\u00e1tico; Asociaci\u00f3n Argentina para el Progreso de las Ciencias","volume":"68","author":"Camilloni I. 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