BOVINE ANAPLASMOSIS TRANSMISSION STUDIES CONDUCTED UNDER CONTROLLED NATURAL EXPOSURE IN A DERMACENTOR-ANDERSONI=(VENUSTUS) INDIGENOUS AREA OF EASTERN OREGON

  • 1 January 1977
    • journal article
    • research article
    • Vol. 38  (3) , 351-354
Abstract
In Anaplasma marginale transmission studies conducted on the high semi-arid range of eastern Oregon [USA] during the 1974 and 1975 vector season, A. marginale-susceptible calves (principals) were maintained on 2 raised tick-proof platforms. Anaplasmosis-susceptible control calves of approximately the same age and latent-infected cows grazed the area surrounding the platforms. One latent-infected steer spent the entire 1975 vector season on a platform with the principals. The 28 principals did not develop anaplasmosis, whereas 15 of 30 (50%) controls became infected. The disease was not transmitted from the latent-infected cattle to the principals exposed only to flying hematophagous insects, whereas 50% of the controls exposed to the Rocky Mountain wood tick (Dermacentor andersoni) developed the disease. D. andersoni appears to be the principal vector on this range.

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