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In this study, a total of 2674 fecal samples were collected from buffaloes (\n                    <jats:italic>N<\/jats:italic>\n                    \u2009=\u2009875), cattle (\n                    <jats:italic>N<\/jats:italic>\n                    \u2009=\u2009770), sheep (\n                    <jats:italic>N<\/jats:italic>\n                    \u2009=\u2009520), and goats (\n                    <jats:italic>N<\/jats:italic>\n                    \u2009=\u2009509) from different age groups across five governorates. All samples were examined using conventional microscopical methods. Using microscopy,\n                    <jats:italic>Giardia<\/jats:italic>\n                    and\n                    <jats:italic>Entamoeba<\/jats:italic>\n                    infections were detected in 626\/2674 (23.4%) and 457\/2674 (17.1%) of samples, respectively, and sheep showed the highest infection rates by both parasites (44.6% and 28.8% for\n                    <jats:italic>Giardia<\/jats:italic>\n                    and\n                    <jats:italic>Entamoeba,<\/jats:italic>\n                    respectively). Representative isolates were molecularly characterized, to confirm parasite identity prior to antigen preparation, targeting\n                    <jats:italic>\u03b2-giardin<\/jats:italic>\n                    (\n                    <jats:italic>bg<\/jats:italic>\n                    ) and small subunit ribosomal RNA (\n                    <jats:italic>ssu rRNA<\/jats:italic>\n                    ) gene, confirmed the presence of\n                    <jats:italic>G. duodenalis<\/jats:italic>\n                    (GenBank:\n                    <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"https:\/\/www.ncbi.nlm.nih.gov\/nuccore\/OQ388331.1?report=GenBank\" ext-link-type=\"uri\">OQ388331.1<\/jats:ext-link>\n                    ,\n                    <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"https:\/\/www.ncbi.nlm.nih.gov\/nuccore\/OQ388332.1?report=GenBank\" ext-link-type=\"uri\">OQ388332.1<\/jats:ext-link>\n                    ,\n                    <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"https:\/\/www.ncbi.nlm.nih.gov\/nuccore\/OR029977.1?report=GenBank\" ext-link-type=\"uri\">OR029977.1<\/jats:ext-link>\n                    ,\n                    <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"https:\/\/www.ncbi.nlm.nih.gov\/nuccore\/OR029976.1?report=GenBank\" ext-link-type=\"uri\">OR029976.1<\/jats:ext-link>\n                    ,\n                    <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"https:\/\/www.ncbi.nlm.nih.gov\/nuccore\/OR029974.1?report=GenBank\" ext-link-type=\"uri\">OR029974.1<\/jats:ext-link>\n                    ,\n                    <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"https:\/\/www.ncbi.nlm.nih.gov\/nuccore\/OR029975.1?report=GenBank\" ext-link-type=\"uri\">OR029975.1<\/jats:ext-link>\n                    and\n                    <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"https:\/\/www.ncbi.nlm.nih.gov\/nuccore\/PP316110.1?report=GenBank\" ext-link-type=\"uri\">PP316110.1<\/jats:ext-link>\n                    ) and\n                    <jats:italic>E. histolytica<\/jats:italic>\n                    (GenBank:\n                    <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"https:\/\/www.ncbi.nlm.nih.gov\/nuccore\/OR016432.1?report=GenBank\" ext-link-type=\"uri\">OR016432.1<\/jats:ext-link>\n                    ). Antigens were prepared separately from these isolates, and the polyclonal antibodies (pAbs) were prepared in rabbits and purified using Protein-A-Sepharose affinity columns. Then, Anti\u2011\n                    <jats:italic>Giardia<\/jats:italic>\n                    IgG pAbs and Anti-\n                    <jats:italic>Entamoeba<\/jats:italic>\n                    IgG pAbs in-house sandwich ELISAs were tested separately on all fecal samples revealing infection rates of 45.2% (1208\/2674) for\n                    <jats:italic>Giardia<\/jats:italic>\n                    sp. and 30.1% (805\/2674) for\n                    <jats:italic>Entamoeba<\/jats:italic>\n                    sp. with high ability to detect\n                    <jats:italic>Giardia<\/jats:italic>\n                    (\n                    <jats:italic>\u03c7<\/jats:italic>\n                    <jats:sup>\n                      <jats:italic>2<\/jats:italic>\n                    <\/jats:sup>\n                    \u2009=\u2009281.2,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u2009\n                    <jats:italic>0.001<\/jats:italic>\n                    ) and\n                    <jats:italic>Entamoeba<\/jats:italic>\n                    (\n                    <jats:italic>\u03c7<\/jats:italic>\n                    <jats:sup>\n                      <jats:italic>2<\/jats:italic>\n                    <\/jats:sup>\n                    \u2009=\u2009125.6,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u2009\n                    <jats:italic>0.001<\/jats:italic>\n                    ) species compared to microscopy. In conclusion, the developed sandwich ELISA in our study represents a sensitive and reliable diagnostic tool for the detection of\n                    <jats:italic>Giardia<\/jats:italic>\n                    and\n                    <jats:italic>Entamoeba<\/jats:italic>\n                    infections in farm animals. Its application in routine surveillance along with complementary molecular confirmation could help to improve epidemiological accuracy and assess zoonotic risks.\n                  <\/jats:p>","DOI":"10.1186\/s12917-026-05801-4","type":"journal-article","created":{"date-parts":[[2026,8,14]],"date-time":"2026-08-14T11:34:57Z","timestamp":1786707297000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Giardia duodenalis and Entamoeba spp.: Coprological and antibody\u2013based approaches across farm animals in Egypt"],"prefix":"10.1186","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9718-5130","authenticated-orcid":false,"given":"Nagwa I.","family":"Toaleb","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0723-7276","authenticated-orcid":false,"given":"Kadria N.","family":"Abdel Megeed","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2581-6503","authenticated-orcid":false,"given":"Dina","family":"Aboelsoued","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,8,14]]},"reference":[{"key":"5801_CR1","unstructured":"Abd El Hafez SM, Anwar AM, Ibrahim AM, Mahmoud MB, Hassan HM. 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All fecal samples used in this study were collected from farm animals after taking consent from their owners. We confirm that all experiments and methods were performed in accordance with the relevant guidelines and regulations under the above-mentioned approval and in accordance with Animal Research: Reporting of In vivo experiments (ARRIVE) guidelines.","order":1,"name":"Ethics","label":"Ethics approval and consent to participate","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"Not Applicable.","order":2,"name":"Ethics","label":"Consent for publication","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"The authors declare no competing interests.","order":3,"name":"Ethics","label":"Competing interests","group":{"name":"EthicsHeading","label":"Declarations"}}],"article-number":"475"}}