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A new ovine Babesia species transmitted by Hyalomma anatolicum anatolicum |
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| Authors: | Guiquan Guan Miling Ma Junlong Liu Qi Bai Wayne Jorgensen Hong Yin |
| Affiliation: | a Key Laboratory of Veterinary Parasitology of Gansu Province, Key Laboratory of Grazing Animal Diseases MOA, State Key Laboratory of Veterinary Etiological Biology, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Science, Xujiaping 1, Lanzhou, Gansu 730046, PR China b UMR ENVN/INRA 1300, BIOEPAR, École Nationale Vétérinaire de Nantes, Atlanpole-La Chantrerie, BP 40706, 44307 Nantes Cedex 03, France c Emerging Technologies, Industry Services, Department of Primary Industries and Fisheries, Locked Mail Bag No. 4, Moorooka, 4105 Qld., Australia |
| Abstract: | 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) μm × 1.06 (±0.22) μm. 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. |
| Keywords: | Babesia sp. Xinjiang Virulence Morphology Hyalomma anatolicum anatolicum Experimental transmission |
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