Journal
EXPERIMENTAL PARASITOLOGY
Volume 122, Issue 4, Pages 261-267Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.exppara.2009.05.001
Keywords
Babesia sp Xinjiang; Virulence; Morphology; Hyalomma anatolicum anatolicum; Experimental transmission
Categories
Funding
- 863 Project [2006AA1 OA207]
- Supporting Plan [2007BAD40B00]
- National Natural Sciences Foundation of China [30800820, 30571397]
- National Natural Resource Platform Project [2005DKA21 100]
- Specific Fund for Sino-Europe Cooperation, MOST, China
- National Public Interests Research Institute Basic Scientific Research Expenses Special Fund Project
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The pathogenicity and morphology of a large Babesia species, Babesia sp. Xinjiang, are described here. The parasite has very low virulence for sheep, and caused no detectable clinical symptoms. Splenectomized sheep infected with the parasite showed mild fever and low parasitemia and would recover gradually. If splenectomized sheep were immuno-suppressed with dexamethasone, the parasitemia could reach 8.5%, and death occurred. A splenectomized calf could not be infected with the Babesia species. Paired parasites were the typical form of the Babesia species in erythrocytes and the average size of a pair of parasites was 2.42 (+/- 0.35) mu m x 1.06 (+/- 0.22) mu m. Merozoites were found in the gut, salivary gland. haemolymph, ovary and eggs of female Hyalomma anatolicum anatolicum engorged on sheep infected with the parasites. The results of experimental transmission showed that the larval, nymph and adult stages of H. a. anatolicum could transmit the Babesia species to sheep. (C) 2009 Elsevier Inc. All rights reserved.
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