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Rodents were captured in three localities and fleas were collected directly from their fur. After DNA extraction, fleas were prepared for microscopic identification. PCR amplification of\n gltA<\/jats:italic>\n and\n ompB<\/jats:italic>\n genes was performed on each individual flea to detect and identify\n Rickettsia<\/jats:italic>\n . The\n OmpB<\/jats:italic>\n gene was sequenced and compared using nBLAST to initially identify its similarity with other sequences from GenBank. A phylogenetic tree was constructed to evaluate the relationships of the sequences obtained with others deposited in GenBank. Out of the 253 cricetids (seven species) captured, 87 fleas (four species) were collected. Of them, 10 fleas (11.5%) tested positive for\n Rickettsia<\/jats:italic>\n . According to nBLAST and the phylogenetic tree results, sequences of this study were identified as\n R. felis<\/jats:italic>\n Bouyer et al. Those sequences were obtained only from five of the seven cricetid species and from two of the three localities, as follows: from Street 143 and Diagonal 630, Arana neighbourhood, La Plata District:\n Polygenis<\/jats:italic>\n (\n Polygenis<\/jats:italic>\n )\n axius<\/jats:italic>\n (Jordan and Rothschild) (\n n<\/jats:italic>\n \u2009=\u20093) and\n Polygenis<\/jats:italic>\n (\n Neopolygenis<\/jats:italic>\n )\n atopus<\/jats:italic>\n (Jordan and Rothschild) (\n n<\/jats:italic>\n \u2009=\u20091); and from Balneario La Balandra, Berisso District:\n Polygenis<\/jats:italic>\n (\n Polygenis<\/jats:italic>\n )\n axius<\/jats:italic>\n (\n n<\/jats:italic>\n \u2009=\u20094),\n Polygenis<\/jats:italic>\n (\n Neopolygenis<\/jats:italic>\n )\n atopus<\/jats:italic>\n (\n n<\/jats:italic>\n \u2009=\u20091) and\n Craneopsylla minerva minerva<\/jats:italic>\n (Rothschild) (\n n<\/jats:italic>\n \u2009=\u20091). Our results confirm the presence of\n R. felis<\/jats:italic>\n in fleas parasitizing cricetids in the periurban area of Gran La Plata, which could represent a risk to public health.\n <\/jats:p>","DOI":"10.1111\/mve.70035","type":"journal-article","created":{"date-parts":[[2025,11,22]],"date-time":"2025-11-22T08:46:57Z","timestamp":1763801217000},"page":"33-42","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["\n Rickettsia<\/i>\n <\/scp>\n detection in fleas associated with cricetid rodents in a periurban area of Argentina"],"prefix":"10.1111","volume":"40","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6786-3271","authenticated-orcid":false,"given":"Mario","family":"Espinoza\u2010Carniglia","sequence":"first","affiliation":[{"name":"Centro de Estudios Parasitol\u00f3gicos y de Vectores (CEPAVE) (CONICET\u2010UNLP) La Plata Argentina"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3295-6491","authenticated-orcid":false,"given":"Mauricio","family":"Melis","sequence":"additional","affiliation":[{"name":"Centro de Estudios Parasitol\u00f3gicos y de Vectores (CEPAVE) (CONICET\u2010UNLP) La Plata Argentina"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7081-4929","authenticated-orcid":false,"given":"Mara","family":"Urdapilleta","sequence":"additional","affiliation":[{"name":"Instituto Nacional de Medicina Tropical (INMeT\u2010ANLIS) (Ministerio de Salud de la Naci\u00f3n) Puerto Iguaz\u00fa Argentina"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8490-7683","authenticated-orcid":false,"given":"Dar\u00edo","family":"Balcazar","sequence":"additional","affiliation":[{"name":"Centro de Estudios Parasitol\u00f3gicos y de Vectores (CEPAVE) (CONICET\u2010UNLP) La Plata Argentina"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6530-8143","authenticated-orcid":false,"given":"Luis","family":"Giambelluca","sequence":"additional","affiliation":[{"name":"Centro de Estudios Parasitol\u00f3gicos y de Vectores (CEPAVE) (CONICET\u2010UNLP) La Plata Argentina"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7791-4239","authenticated-orcid":false,"given":"Santiago","family":"Nava","sequence":"additional","affiliation":[{"name":"Instituto Nacional de Tecnolog\u00eda Agropecuaria, Estaci\u00f3n Experimental Agropecuaria Rafaela Santa Fe Argentina"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5300-9100","authenticated-orcid":false,"given":"Marcela","family":"Lareschi","sequence":"additional","affiliation":[{"name":"Centro de Estudios Parasitol\u00f3gicos y de Vectores (CEPAVE) (CONICET\u2010UNLP) La Plata Argentina"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2025,11,22]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.31687\/saremMN.24.31.01.05.e0991"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0022-2836(05)80360-2"},{"key":"e_1_2_10_4_1","first-page":"203","article-title":"Caso aut\u00f3ctono de fiebre manchada por Rickettsia parkeri en Ensenada, Buenos Aires","volume":"78","author":"Apestegui P.","year":"2018","journal-title":"Medicina (B Aires)"},{"key":"e_1_2_10_5_1","volume-title":"Ecology \u2013 from individuals to ecosystems","author":"Begon M.","year":"2006"},{"key":"e_1_2_10_6_1","doi-asserted-by":"publisher","DOI":"10.7705\/biomedica.v32i2.390"},{"key":"e_1_2_10_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijid.2009.11.011"},{"key":"e_1_2_10_8_1","doi-asserted-by":"publisher","DOI":"10.1128\/JCM.42.11.4961-4967.2004"},{"key":"e_1_2_10_9_1","first-page":"219","volume-title":"Atlas Hist\u00f3rico y Geogr\u00e1fico de La Argentina: Calidad de Vida II","author":"Bozzano H.","year":"2022"},{"key":"e_1_2_10_10_1","doi-asserted-by":"publisher","DOI":"10.2307\/3284227"},{"key":"e_1_2_10_11_1","doi-asserted-by":"publisher","DOI":"10.1186\/s13567-015-0217-9"},{"key":"e_1_2_10_12_1","doi-asserted-by":"publisher","DOI":"10.1146\/annurev-ento-120710-100717"},{"key":"e_1_2_10_13_1","unstructured":"Espinoza\u2010Carniglia M.&Lareschi M.(2025)Rickettsiain fleas of rodents from Arana (ARA) La Balandra (BLB) and Estaci\u00f3n Experimental Julio Hirschh\u00f6rn (EEJH) between 2017\u20132019. Consejo Nacional de Investigaciones Cient\u00edficas y T\u00e9cnicas version 1.0. (Dataset). Available from:http:\/\/hdl.handle.net\/11336\/271462"},{"issue":"1","key":"e_1_2_10_14_1","first-page":"42","article-title":"Roedores sigmodontinos de la Provincia de Misiones (Argentina): S\u00edntesis de datos en una d\u00e9cada de muestreos espor\u00e1dicos","volume":"56","author":"Galliari C.","year":"2021","journal-title":"Ecolog\u00eda en Bolivia"},{"key":"e_1_2_10_15_1","doi-asserted-by":"publisher","DOI":"10.1590\/S0074-02762007000700003"},{"key":"e_1_2_10_16_1","unstructured":"Instituto Nacional de Estad\u00edsticas y Censo. (2024)Censo nacional de poblaci\u00f3n hogares y viviendas 2022: Regi\u00f3n Metropolitana Buenos Aires: Ciudad Aut\u00f3noma de Buenos Aires y 39 partidos de la provincia de Buenos Aires. 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