INFECTIVITY FOR CATTLE OF ANAPLASMA MARGINALE EXTRACTED FROM BOOPHILUS MICROPLUS TICKS EXPOSED TO CERTAIN TEMPERATURES |
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| Authors: | R J DALGLIESH N P STEWART |
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| Institution: | Queensland Department of Primary Industries, Animal Research Institute, Yeerongpilly, Queensland, 4105 |
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| Abstract: | SUMMARY: Boophilus microplus ticks collected from calves with patent Anaplasma marginale infections were incubated at either 4 to 5°C, 14°C, 22°C, 27°C or 37°C for up to 14 days. Extracts prepared either from larvae, nymphs, immature females, adult males or mixtures of both sexes were infective for 14 of the 16 splenectomised calves inoculated. Extracts either from nymphs or from adult ticks deriving from nymphs moulted in vitro were infective for 11 of 12 nonsplenectomised calves. Possible application of the findings to producing a vaccine strain of A. marginale is discussed. |
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