{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,28]],"date-time":"2026-09-28T23:35:07Z","timestamp":1790638507196,"version":"4.1.0"},"reference-count":97,"publisher":"Public Library of Science (PLoS)","issue":"8","license":[{"start":{"date-parts":[[2021,8,18]],"date-time":"2021-08-18T00:00:00Z","timestamp":1629244800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"chaire mixte institut national de la sant\u00e9 et de la recherche m\u00e9dicale (inserm) \u2013 universit\u00e9 de la r\u00e9union"}],"content-domain":{"domain":["www.plosone.org"],"crossmark-restriction":false},"short-container-title":["PLoS ONE"],"abstract":"<jats:p><jats:italic>Toxoplasma gondii<\/jats:italic> is a protozoan parasite that uses felids as definitive hosts and warm-blooded animals as intermediate hosts. While the dispersal of <jats:italic>T<\/jats:italic>. <jats:italic>gondii<\/jats:italic> infectious oocysts from land to coastal waters has been well documented, transmission routes to pelagic species remain puzzling. We used the modified agglutination test (MAT titre \u2265 10) to detect antibodies against <jats:italic>T<\/jats:italic>. <jats:italic>gondii<\/jats:italic> in sera collected from 1014 pelagic seabirds belonging to 10 species. Sampling was carried out on eight islands of the Western Indian Ocean: Reunion and Juan de Nova (colonized by cats), Cousin, Cousine, Aride, Bird, Europa and Tromelin islands (cat-free). Antibodies against <jats:italic>T<\/jats:italic>. <jats:italic>gondii<\/jats:italic> were found in all islands and all species but the great frigatebird. The overall seroprevalence was 16.8% [95% CI: 14.5%-19.1%] but significantly varied according to species, islands and age-classes. The low antibody levels (MAT titres = 10 or 25) detected in one shearwater and three red-footed booby chicks most likely resulted from maternal antibody transfer. In adults, exposure to soils contaminated by locally deposited oocysts may explain the detection of antibodies in both wedge-tailed shearwaters on Reunion Island and sooty terns on Juan de Nova. However, 144 adults breeding on cat-free islands also tested positive. In the Seychelles, there was a significant decrease in <jats:italic>T<\/jats:italic>. <jats:italic>gondii<\/jats:italic> prevalence associated with greater distances to cat populations for species that sometimes rest on the shore, i.e. terns and noddies. This suggests that oocysts carried by marine currents could be deposited on shore tens of kilometres from their initial deposition point and that the number of deposited oocysts decreases with distance from the nearest cat population. The consumption of fishes from the families Mullidae, Carangidae, Clupeidae and Engraulidae, previously described as <jats:italic>T<\/jats:italic>. <jats:italic>gondii<\/jats:italic> oocyst-carriers (i.e. paratenic hosts), could also explain the exposure of terns, noddies, boobies and tropicbirds to <jats:italic>T<\/jats:italic>. <jats:italic>gondii<\/jats:italic>. Our detection of antibodies against <jats:italic>T<\/jats:italic>. <jats:italic>gondii<\/jats:italic> in seabirds that fish in the high sea, have no contact with locally contaminated soils but frequent the shores and\/or consume paratenic hosts supports the hypothesis of an open-sea dispersal of <jats:italic>T<\/jats:italic>. <jats:italic>gondii<\/jats:italic> oocysts by oceanic currents and\/or fish.<\/jats:p>","DOI":"10.1371\/journal.pone.0255664","type":"journal-article","created":{"date-parts":[[2021,8,18]],"date-time":"2021-08-18T18:00:15Z","timestamp":1629309615000},"page":"e0255664","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":16,"title":["Exposure of pelagic seabirds to Toxoplasma gondii in the Western Indian Ocean points to an open sea dispersal of this terrestrial parasite"],"prefix":"10.1371","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2445-5133","authenticated-orcid":true,"given":"Marie-Lazarine","family":"Poulle","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matthieu","family":"Le 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