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Over a 2-year period,<jats:italic>Cryptosporidium<\/jats:italic>oocysts were detected in 239 of the 3,557 (6.7%) eastern grey kangaroo fecal samples tested by using a combined immunomagnetic separation and flow cytometric technique. The prevalence of<jats:italic>Cryptosporidium<\/jats:italic>in this host population was estimated to range from 0.32% to 28.5%, with peaks occurring during the autumn months. Oocyst shedding intensity ranged from below 20 oocysts\/g feces to 2.0 \u00d7 10<jats:sup>6<\/jats:sup>oocysts\/g feces, and shedding did not appear to be associated with diarrhea. Although morphologically similar to the human-infective<jats:italic>Cryptosporidium hominis<\/jats:italic>and the<jats:italic>Cryptosporidium parvum<\/jats:italic>\u201cbovine\u201d genotype oocysts, the oocysts isolated from kangaroo feces were identified as the<jats:italic>Cryptosporidium<\/jats:italic>\u201cmarsupial\u201d genotype I or \u201cmarsupial\u201d genotype II. Kangaroos are the predominant large mammal inhabiting Australian watersheds and are potentially a significant source of<jats:italic>Cryptosporidium<\/jats:italic>contamination of drinking water reservoirs. However, this host population was predominantly shedding the marsupial-derived genotypes, which to date have been identified only in marsupial host species.<\/jats:p>","DOI":"10.1128\/aem.71.10.6159-6164.2005","type":"journal-article","created":{"date-parts":[[2005,10,4]],"date-time":"2005-10-04T19:29:23Z","timestamp":1128454163000},"page":"6159-6164","update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":39,"title":["Patterns of<i>Cryptosporidium<\/i>Oocyst Shedding by Eastern Grey Kangaroos Inhabiting an Australian Watershed"],"prefix":"10.1128","volume":"71","author":[{"given":"Michelle L.","family":"Power","sequence":"first","affiliation":[{"name":"Department of Biological Sciences, Macquarie University, Sydney, New South Wales 2109"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nicholas C.","family":"Sangster","sequence":"additional","affiliation":[{"name":"Faculty of Veterinary Science, University of Sydney, Sydney, New South Wales 2006, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Martin B.","family":"Slade","sequence":"additional","affiliation":[{"name":"Department of Biological Sciences, Macquarie University, Sydney, New South Wales 2109"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Duncan A.","family":"Veal","sequence":"additional","affiliation":[{"name":"Department of Biological Sciences, Macquarie University, Sydney, New South Wales 2109"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"235","reference":[{"key":"e_1_3_2_2_2","first-page":"75","year":"1993","unstructured":"Anderson, R. 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