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Patterns of Cryptosporidium oocyst shedding by eastern grey kangaroos inhabiting an Australian watershed

机译:居住在澳大利亚流域的东部灰色袋鼠的隐孢子虫卵囊脱落模式

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摘要

The occurrence of Cryptosporidium oocysts in feces from a population of wild eastern grey kangaroos inhabiting a protected watershed in Sydney, Australia, was investigated. Over a 2-year period, Cryptosporidium 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 Cryptosporidium 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 × 10⁶ oocysts/g feces, and shedding did not appear to be associated with diarrhea. Although morphologically similar to the human-infective Cryptosporidium hominis and the Cryptosporidium parvum “bovine” genotype oocysts, the oocysts isolated from kangaroo feces were identified as the Cryptosporidium “marsupial” genotype I or “marsupial” genotype II. Kangaroos are the predominant large mammal inhabiting Australian watersheds and are potentially a significant source of Cryptosporidium 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.
机译:调查了居住在澳大利亚悉尼一个受保护的分水岭的野生东部灰色袋鼠种群的粪便中隐孢子虫卵囊的发生情况。在2年的时间里,使用免疫磁分离和流式细胞术相结合的方法,在3,557例(6.7%)东部灰色袋鼠粪便样本中,有239例检测到隐孢子虫卵囊。在该寄主种群中,隐孢子虫的患病率估计为0.32%至28.5%,峰值发生在秋季月份。卵囊脱落强度的范围从低于20个卵囊/克粪便到2.0×10 6个卵囊/克粪便,并且脱落似乎与腹泻无关。尽管从形态上类似于人感染隐孢子虫和小隐隐孢子虫“牛”基因型卵囊,但从袋鼠粪便中分离出的卵囊被鉴定为隐孢子虫“有袋动物” I型或“有袋动物”基因型II。袋鼠是居住在澳大利亚流域的主要大型哺乳动物,并且可能是饮用水水库隐孢子虫污染的重要来源。然而,该寄主种群主要脱落有袋动物衍生的基因型,迄今为止,仅在有袋动物寄主物种中才发现。

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