{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,25]],"date-time":"2026-08-25T23:45:28Z","timestamp":1787701528501,"version":"build-2784847793"},"reference-count":40,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2025,3,29]],"date-time":"2025-03-29T00:00:00Z","timestamp":1743206400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"FONTAGRO","award":["ATN\/RF 18136 RG"],"award-info":[{"award-number":["ATN\/RF 18136 RG"]}]},{"name":"FONTAGRO","award":["PICT 2021-GRF TI 00656"],"award-info":[{"award-number":["PICT 2021-GRF TI 00656"]}]},{"name":"FONTAGRO","award":["PNSA PDI114"],"award-info":[{"award-number":["PNSA PDI114"]}]},{"name":"FONTAGRO","award":["PEI078"],"award-info":[{"award-number":["PEI078"]}]},{"name":"Ministry of Science and Technology","award":["ATN\/RF 18136 RG"],"award-info":[{"award-number":["ATN\/RF 18136 RG"]}]},{"name":"Ministry of Science and Technology","award":["PICT 2021-GRF TI 00656"],"award-info":[{"award-number":["PICT 2021-GRF TI 00656"]}]},{"name":"Ministry of Science and Technology","award":["PNSA PDI114"],"award-info":[{"award-number":["PNSA PDI114"]}]},{"name":"Ministry of Science and Technology","award":["PEI078"],"award-info":[{"award-number":["PEI078"]}]},{"name":"National Institute of Agricultural Technology","award":["ATN\/RF 18136 RG"],"award-info":[{"award-number":["ATN\/RF 18136 RG"]}]},{"name":"National Institute of Agricultural Technology","award":["PICT 2021-GRF TI 00656"],"award-info":[{"award-number":["PICT 2021-GRF TI 00656"]}]},{"name":"National Institute of Agricultural Technology","award":["PNSA PDI114"],"award-info":[{"award-number":["PNSA PDI114"]}]},{"name":"National Institute of Agricultural Technology","award":["PEI078"],"award-info":[{"award-number":["PEI078"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Animals"],"abstract":"<jats:p>Family poultry production systems (FPPSs) in Chile and Argentina produce high-quality and nutritious food. However, little is known about chicken coccidiosis in these production systems. This work aimed to determine the Eimeria sp. positivity rate, circulating species, general farm management, and knowledge of the disease in FPPSs by gaining access to peri-urban markets in these two countries. The overall Eimeria sp. positivity rate, determined in 88 fecal samples, was 85.1%. Oocysts per gram in Argentinean meat-producing FPPSs were significantly higher than in Argentinean and Chilean egg-producing FPPSs. Multiplex-PCR based on seven Eimeria spp. Sequence-Characterized Amplified Region (SCAR) markers showed a great diversity of circulating species, with E. mitis (70.3%), E. acervulina (62.2%), and E. tenella (59.5%), followed by E. maxima (43.2%), E. praecox (32.4%), E. necatrix (18.9%), and E. brunetti (5.4%). Low awareness among family producers and low implementation of control measures were found. Importantly, pathogenic species were found even in asymptomatic chickens, which represents a potential chicken health threat. Furthermore, the administration of sulfonamides to broilers with clinical signs poses a risk of environmental contamination. This is the first comprehensive cross-sectional study showing that Eimeria sp. is a persistent parasite in peri-urban FPPSs in Argentina and Chile.<\/jats:p>","DOI":"10.3390\/ani15070982","type":"journal-article","created":{"date-parts":[[2025,4,1]],"date-time":"2025-04-01T04:21:01Z","timestamp":1743481261000},"page":"982","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Chicken Coccidiosis in Peri-Urban Family Farming in Two South American Countries: Prevalence and Circulating Eimeria spp."],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0408-8356","authenticated-orcid":false,"given":"Mariela L.","family":"Tomazic","sequence":"first","affiliation":[{"name":"Instituto de Patobiolog\u00eda Veterinaria (IPVET), Unidad de Doble Dependencia, INTA-CONICET, Hurlingham B1686, Argentina"},{"name":"C\u00e1tedra de Biotecnolog\u00eda, Facultad de Farmacia y Bioqu\u00edmica (FFyB), Universidad de Buenos Aires (UBA), Buenos Aires C1113, Argentina"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jesica D.","family":"Britez","sequence":"additional","affiliation":[{"name":"Instituto de Patobiolog\u00eda Veterinaria (IPVET), Unidad de Doble Dependencia, INTA-CONICET, Hurlingham B1686, Argentina"},{"name":"C\u00e1tedra de Parasitolog\u00eda, Facultad de Ciencias Veterinarias, Universidad de Buenos Aires (UBA), Buenos Aires C1113, Argentina"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mar\u00eda Luz","family":"Pis\u00f3n-Mart\u00ednez","sequence":"additional","affiliation":[{"name":"Instituto de Patobiolog\u00eda Veterinaria (IPVET), Unidad de Doble Dependencia, INTA-CONICET, Hurlingham B1686, Argentina"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pablo","family":"Barbano","sequence":"additional","affiliation":[{"name":"Estaci\u00f3n Experimental Agropecuaria (EEA), INTA, Luj\u00e1n B6700, Argentina"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zulma","family":"Canet","sequence":"additional","affiliation":[{"name":"EEA, INTA Pergamino, Buenos Aires C1113, Argentina"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1123-5249","authenticated-orcid":false,"given":"Marcos D.","family":"Trangoni","sequence":"additional","affiliation":[{"name":"Instituto de Agrobiotecnolog\u00eda y Biolog\u00eda Molecular (IABIMO), INTA-CONICET, Hurlingham B1686, Argentina"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0384-6066","authenticated-orcid":false,"given":"Tom\u00e1s J.","family":"Poklepovich","sequence":"additional","affiliation":[{"name":"Unidad Operativa Centro Nacional de Gen\u00f3mica y Bioinform\u00e1tica-ANLIS \u201cDr. Carlos G. Malbr\u00e1n\u201d, Buenos Aires C1113, Argentina"},{"name":"C\u00e1tedra F\u00edsica, FFyB, Universidad de Buenos Aires (UBA), Buenos Aires C1113, Argentina"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-3172-0330","authenticated-orcid":false,"given":"Facundo","family":"Cubas","sequence":"additional","affiliation":[{"name":"Unidad Operativa Centro Nacional de Gen\u00f3mica y Bioinform\u00e1tica-ANLIS \u201cDr. Carlos G. Malbr\u00e1n\u201d, Buenos Aires C1113, Argentina"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1608-2499","authenticated-orcid":false,"given":"Ra\u00fal","family":"Alegr\u00eda-Mor\u00e1n","sequence":"additional","affiliation":[{"name":"Escuela de Medicina Veterinaria, Sede Santiago, Facultad de Recursos Naturales y Medicina Veterinaria, Universidad Santo Tom\u00e1s, Santiago 8370003, Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8415-7918","authenticated-orcid":false,"given":"Galia","family":"Ram\u00edrez-Toloza","sequence":"additional","affiliation":[{"name":"Laboratorio de Parasitolog\u00eda y Enfermedades Parasitarias, Facultad de Ciencias Veterinarias y Pecuarias, Universidad de Chile, Santa Rosa 11735, La Pintana, Santiago 8820808, Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2436-8101","authenticated-orcid":false,"given":"Anabel E.","family":"Rodr\u00edguez","sequence":"additional","affiliation":[{"name":"Instituto de Patobiolog\u00eda (IP), IP-IPVET, Hurlingham B1686, Argentina"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,3,29]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"102339","DOI":"10.1016\/j.psj.2022.102339","article-title":"Research Note: Characterization of peasant family poultry farming in Southern Chile","volume":"102","author":"Asencio","year":"2023","journal-title":"Poultry Sci."},{"key":"ref_2","unstructured":"(2024, December 30). 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