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As with domestic livestock, it is important to understand the occurrence in these seals of infectious agents that may be of public health significance and thus ensure appropriate measures are in place to avoid zoonotic transmission. This study examined the prevalence of antibodies against<jats:italic>Brucella<\/jats:italic>spp.,<jats:italic>Erysipelothrix rhusiopathiae<\/jats:italic>, 6 serovars of<jats:italic>Leptospira interrogans<\/jats:italic>, and<jats:italic>Toxoplasma gondii<\/jats:italic>in 59 grey seals and determined by polymerase chain reaction (PCR) the presence of these potentially zoonotic agents in specific organs and tissues of seropositive animals. The presence of encysted<jats:italic>Trichinella<\/jats:italic>spp. larvae was also investigated by digestion of tongue, diaphragm and other muscle samples, but none were detected. Seroprevalence against<jats:italic>Brucella<\/jats:italic>spp. and<jats:italic>E. rhusiopathiae<\/jats:italic>was low (5 and 3%, respectively). All 59 seals tested had antibodies against<jats:italic>L. interrogans<\/jats:italic>, but no carrier of this bacterium was detected by PCR. Seroprevalence against<jats:italic>T. gondii<\/jats:italic>was 53%, and DNA of this protozoan was detected by PCR in 11\/30 (37%) seropositive animals. Standard sanitary measures mandatory for commercialization of meat products for human consumption should greatly reduce the potential for exposure to these infectious agents. However, special consideration should be given to freezing seal meat for at least 3 d to ensure destruction of tissue cysts of<jats:italic>T. gondii<\/jats:italic>.<\/jats:p>","DOI":"10.3354\/dao03536","type":"journal-article","created":{"date-parts":[[2020,10,2]],"date-time":"2020-10-02T09:59:01Z","timestamp":1601632741000},"page":"105-118","update-policy":"https:\/\/doi.org\/10.3354\/policy","source":"Crossref","is-referenced-by-count":5,"title":["Exposure of the Gulf of St. Lawrence grey seal Halichoerus grypus population to potentially zoonotic infectious agents"],"prefix":"10.3354","volume":"142","author":[{"given":"CC","family":"Sauv\u00e9","sequence":"first","affiliation":[{"name":"Facult\u00e9 de m\u00e9decine v\u00e9t\u00e9rinaire, Universit\u00e9 de Montr\u00e9al, Saint-Hyacinthe, QC J2S 2M2, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"A","family":"Hern\u00e1ndez-Ortiz","sequence":"additional","affiliation":[{"name":"Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK S7N 5B4, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"E","family":"Jenkins","sequence":"additional","affiliation":[{"name":"Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK S7N 5B4, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"F","family":"Mavrot","sequence":"additional","affiliation":[{"name":"Faculty of Veterinary Medicine, University of Calgary, Calgary, AB T2N 4Z6, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"A","family":"Schneider","sequence":"additional","affiliation":[{"name":"Faculty of Veterinary Medicine, University of Calgary, Calgary, AB T2N 4Z6, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"S","family":"Kutz","sequence":"additional","affiliation":[{"name":"Faculty of Veterinary Medicine, University of Calgary, Calgary, AB T2N 4Z6, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"JT","family":"Saliki","sequence":"additional","affiliation":[{"name":"Athens Veterinary Diagnostic Laboratory, University of Georgia, Athens, GA 30602, USA"},{"name":"Oklahoma Animal Disease Diagnostic Laboratory, College of Veterinary Medicine, Oklahoma State University, Stillwater, OK 74078, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"PY","family":"Daoust","sequence":"additional","affiliation":[{"name":"Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, PE C1A 4P3, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1913","reference":[{"key":"Ref1","unstructured":"Ahmad SN, Shah S, Ahmad FMH (2005) Laboratory diagnosis of leptospirosis. 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