Graduate Thesis Or Dissertation
 

Transmission of bovine anaplasmosis in eastern Oregon by field collections of Dermacentor andersoni Stiles=(Venustus)

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  • In the spring and summer of 1975 a study was conducted under natural conditions to determine whether wild adult Dermacentor andersoni Stiles would transmit Anaplasma marginale to cattle. The ticks were collected from the range pasture of Squaw Butte Experiment Station where anaplasmosis is enzootic and D. andersoni is indigenous. Adult D. andersoni ticks were collected by flagging and by the use of CO₂ traps from pastures of Squaw Butte Station in which latent infected cows were grazing. These ticks were placed on two calves. A. marginale infection was produced when 237 adult ticks of both sexes were allowed to attach and feed on a susceptible unsplenectomized calf, but was not produced by 217 adult ticks placed on a second unsplenectomized calf. These results show that transmission of anaplasmosis to cattle by D. andersoni ticks does occur on this range.
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