{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,28]],"date-time":"2026-09-28T23:35:28Z","timestamp":1790638528592,"version":"4.1.0"},"reference-count":62,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2019,8,13]],"date-time":"2019-08-13T00:00:00Z","timestamp":1565654400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000192","name":"National Oceanic and Atmospheric Administration","doi-asserted-by":"publisher","award":["NA15NMF4270303"],"award-info":[{"award-number":["NA15NMF4270303"]}],"id":[{"id":"10.13039\/100000192","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000001","name":"National Science Foundation","doi-asserted-by":"publisher","award":["1460861"],"award-info":[{"award-number":["1460861"]}],"id":[{"id":"10.13039\/100000001","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000001","name":"National Science Foundation","doi-asserted-by":"publisher","award":["11A-1355457"],"award-info":[{"award-number":["11A-1355457"]}],"id":[{"id":"10.13039\/100000001","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Pathogens"],"abstract":"<jats:p>Shellfish are known as a potential source of Toxoplasma gondii (responsible for toxoplasmosis), and Cryptosporidium parvum, which is one of the major causes of gastroenteritis in the world. Here we performed a comprehensive qPCR-based monthly survey for T. gondii and C. parvum during 2016 and 2017 in oysters (Crassostrea virginica) (n = 1440) from all six sites along the coast of Maine (USA). Pooled samples (mantle, gills, and rectum) from individual oysters were used for DNA extraction and qPCR. Our study resulted in detections of qPCR positives oysters for T. gondii and C. parvum at each of the six sites sampled (in 31% and 10% of total oysters, respectively). The prevalence of T. gondii was low in 2016, and in September 2017 several sites peaked in prevalence with 100% of the samples testing positive. The prevalence of C. parvum was very low except in one estuarine location (Jack\u2019s Point) in June 2016 (58%), and in October of 2016, when both prevalence and density of C. parvum at most of the sampling sites were among the highest values detected. Statistical analysis of environmental data did not identify clear drivers of retention, but there were some notable statistically significant patterns including current direction and nitrate along with the T. gondii prevalence. The major C. parvum retention event (in October 2016) corresponded with the month of highest dissolved oxygen measurements as well as a shift in the current direction revealed by nearby instrumentation. This study may guide future research to locate any contributing parasite reservoirs and evaluate the potential risk to human consumption.<\/jats:p>","DOI":"10.3390\/pathogens8030125","type":"journal-article","created":{"date-parts":[[2019,8,13]],"date-time":"2019-08-13T04:31:21Z","timestamp":1565670681000},"page":"125","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":29,"title":["Molecular Epizootiology of Toxoplasma gondii and Cryptosporidium parvum in the Eastern Oyster (Crassostrea virginica) from Maine (USA)"],"prefix":"10.3390","volume":"8","author":[{"given":"Nicholas D.","family":"Marquis","sequence":"first","affiliation":[{"name":"Bigelow Laboratory for Ocean Sciences, Boothbay, ME 04544, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Theodore J.","family":"Bishop","sequence":"additional","affiliation":[{"name":"Bigelow Laboratory for Ocean Sciences, Boothbay, ME 04544, USA"},{"name":"Southern Maine Community College, South Portland, ME 04106, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nicholas R.","family":"Record","sequence":"additional","affiliation":[{"name":"Bigelow Laboratory for Ocean Sciences, Boothbay, ME 04544, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter D.","family":"Countway","sequence":"additional","affiliation":[{"name":"Bigelow Laboratory for Ocean Sciences, Boothbay, ME 04544, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7544-6918","authenticated-orcid":false,"given":"Jos\u00e9 A.","family":"Fern\u00e1ndez Robledo","sequence":"additional","affiliation":[{"name":"Bigelow Laboratory for Ocean Sciences, Boothbay, ME 04544, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2019,8,13]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"14","DOI":"10.1016\/j.watres.2017.01.036","article-title":"Waterborne transmission of protozoan parasites: Review of worldwide outbreaks\u2014An update 2011\u20132016","volume":"114","author":"Efstratiou","year":"2017","journal-title":"Water Res."},{"key":"ref_2","first-page":"e05495","article-title":"Public health risks associated with food-borne parasites","volume":"16","author":"Koutsoumanis","year":"2018","journal-title":"EFSA J."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"333","DOI":"10.1080\/20477724.2017.1370528","article-title":"Prophylaxis of human toxoplasmosis: A systematic review","volume":"111","author":"Rajapakse","year":"2017","journal-title":"Pathog. 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