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Nevertheless, epidemiological data are scarce worldwide, especially in remote locations. The emergence of novel technologies and diagnostic platforms facilitates comprehensive screening of multiple GI parasites. Our study aims to establish a baseline prevalence for GI parasites in dogs from Saipan, Northern Mariana Islands.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      Fecal samples were collected from dogs (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u2009420) from May to June 2023 during a spay-neuter campaign. Age, sex, ownership status, and residing location were recorded. Following genomic extraction, samples were screened using the KeyScreen\u2122 GI Parasite PCR (Antech Diagnostics), a real-time PCR panel that detects 20 endoparasite infections, detects benzimidazole resistance in\n                      <jats:italic>Ancylostoma caninum<\/jats:italic>\n                      , and determines the zoonotic potential of\n                      <jats:italic>Giardia duodenalis<\/jats:italic>\n                      . If inconclusive results for\n                      <jats:italic>Ancylostoma<\/jats:italic>\n                      spp. were obtained, conventional PCR and Sanger sequencing were performed, targeting the ITS-1 region for species identification. Additionally, demographics (i.e. age, sex, ownership, and residing location) were evaluated as potential risk factors for each pathogen as the outcome with an initial univariate analysis, followed by multivariable logistic regression with backward stepwise selection.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Overall, parasites were detected in 267\/420 (63.5%; 95% CI: 58.7\u201368.1) canine samples. The most detected parasite genus was\n                      <jats:italic>Ancylostoma<\/jats:italic>\n                      spp. (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u2009224; 53.3%), followed by\n                      <jats:italic>G. duodenalis<\/jats:italic>\n                      (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u200967; 15.9%),\n                      <jats:italic>Trichuris<\/jats:italic>\n                      (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u200939; 9.2%),\n                      <jats:italic>Dipylidium<\/jats:italic>\n                      (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u200925; 5.9%),\n                      <jats:italic>Toxocara<\/jats:italic>\n                      (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u200915; 3.5%),\n                      <jats:italic>Cystoisospora<\/jats:italic>\n                      (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u200910; 2.3%), and\n                      <jats:italic>Cryptosporidium<\/jats:italic>\n                      (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u20095; 1.1%). Assemblages with zoonotic potential of\n                      <jats:italic>G. duodenalis<\/jats:italic>\n                      and the SNPs 167Y and 134H in the isotype 1 Beta-tubulin gene associated with benzimidazole-resistance in\n                      <jats:italic>A. caninum<\/jats:italic>\n                      were not detected. Risk factors significantly associated with infection were age, district, and ownership with\n                      <jats:italic>Trichuris<\/jats:italic>\n                      ; age and ownership with\n                      <jats:italic>Ancylostoma<\/jats:italic>\n                      ,\n                      <jats:italic>Giardia<\/jats:italic>\n                      , and\n                      <jats:italic>Dipylidium<\/jats:italic>\n                      ; and ownership with\n                      <jats:italic>Toxocara<\/jats:italic>\n                      and\n                      <jats:italic>Cystoisospora<\/jats:italic>\n                      . Hookworm-positive samples were further characterized to species level. Overall,\n                      <jats:italic>Ancylostoma caninum<\/jats:italic>\n                      and\n                      <jats:italic>A. ceylanicum<\/jats:italic>\n                      \/\n                      <jats:italic>A. duodenale<\/jats:italic>\n                      were confirmed in 196 (46.7%) and 57 (13.5%) dogs, respectively. Further sequencing confirmed the presence of zoonotic\n                      <jats:italic>A. ceylanicum<\/jats:italic>\n                      in at least 21 samples, approximately 5% of the sampled dog population, distributed geographically across all districts.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>\n                      To our knowledge, our study is the first to provide epidemiological data on canine gastrointestinal parasites in Saipan. The high prevalence of multiple parasites of One Health importance reinforces the need for surveillance and the implementation of prevention and control strategies island-wide, especially targeting\n                      <jats:italic>A. ceylanicum<\/jats:italic>\n                      , a zoonotic hookworm, that may establish patent infections in both companion animals and humans.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Graphical Abstract<\/jats:title>\n                  <\/jats:sec>","DOI":"10.1186\/s13071-026-07258-8","type":"journal-article","created":{"date-parts":[[2026,1,28]],"date-time":"2026-01-28T04:34:48Z","timestamp":1769574888000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["High prevalence of gastrointestinal parasites in dogs from Saipan, Northern Mariana Islands, including the zoonotic Ancylostoma ceylanicum"],"prefix":"10.1186","volume":"19","author":[{"given":"Maureen A.","family":"Kelly","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kris","family":"Anderson","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pablo D. 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Each dog owner and shelter manager gave consent for collection. Fecal sample screening was performed prospectively approximately 1\u00a0year after collection; therefore, the results were not shared with the owners or the shelter manager.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics"}},{"value":"All authors consent to the publication of this manuscript.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"The authors declare the following financial interests\/personal relationships, which may be considered as potential competing interests: The commercial real-time qPCR test used for analysis of samples in this study was KeyScreen\u2122 GI Parasite PCR, an Antech Diagnostics, Inc., Mars Petcare Science & Diagnostics product. PDJC, CML, CS, SL, and JT are employed by Antech Diagnostics, Inc., Mars Petcare Science & Diagnostics.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interest"}}],"article-number":"93"}}