Isolation and preliminary characterization of a large Babesia sp from sheep and goats in the eastern part of Gansu Province, China
Isolation and preliminary characterization of a large Babesia sp from sheep and goats in the eastern part of Gansu Province, China
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DOI：
10.1007/s00436-001-0563-6
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发表时间：
2002-05-01
影响因子：
2
通讯作者：
Li, X
中科院分区：
文献类型：
--
作者：
Bai, Q;Liu, QY;Li, X
从甘肃省东部自然感染的绵羊中分离到2种巴贝斯虫。其中一种被鉴定为B. ovis，而另一种似乎尚未被鉴定为巴贝斯虫。后者可由长角血蜱经卵巢传播。结果表明，幼虫和若虫在出生前5 ~ 28天将该病菌传播给绵羊和山羊。由于大巴贝斯虫的携带期比大巴贝斯虫的携带期长，大巴贝斯虫的前置期比大巴贝斯虫短，因此有可能分离出未确定的大巴贝斯虫。较大的巴贝斯虫具有多态性，包括双梨形、单梨形、环状、棒状、三叶和出芽形式。典型成对梨形的大小为1.8 ~ 2.5 μ m × 0.9 ~ 1.8 μ m。平均尺寸为2.21 +/- 0.12 mm × 1.17 +/- 0.18 mm。该寄生虫引起严重的感染过程，伴有高达23.7%的寄生虫血症，绵羊和山羊的死亡率都很高。在羔羊和进口的小反刍动物身上非常明显。
Two species of Babesia were isolated from naturally infected sheep in the eastern part of Gansu province. One of the species was identified as B. ovis, while the another one seems as yet to be an unidentified Babesia species. The latter could be transmitted transovarially by Haemaphysalis longicornis. It was shown that larvae and nymphs transmit the organism to sheep and goats with a prepatent period of 5-28 days. As the carrier period of B. ovis is longer than that of the larger species and the prepatent period of the larger Babesia is shorter than that of B. ovis, it was possible to isolate the unidentified larger species. The larger Babesia is polymorphic, including double pyriform, single pyriform, ring-form, rod-like, three-leafed and budding forms. The size of typical paired pyriforms was 1.8-2.5 mum x 0.9-1.8 mum. with mean dimensions of 2.21 +/- 0.12 mum x 1.17 +/- 0.18 mum. The parasite causes a severe course of infection associated with a parasitaemia as high as 23.7% and with a high mortality rate in both sheep and goats. being very marked in lambs and imported small ruminants.