TitleBovine anaplasmosis transmission studies conducted under controlled natural exposure in a Dermacentor andersoni = (venustus) indigenous area of eastern Oregon.
Publication TypeJournal Article
Year of Publication1977
AuthorsPeterson, KJ, Raleigh, RJ, Stroud, RK, Goulding, RL
JournalAm J Vet Res
Date Published1977 Mar
KeywordsAnaplasmosis, Animals, Arthropod Vectors, Cattle, Cattle Diseases, Ceratopogonidae, Dermacentor, Diptera, Female, Male, Oregon, Ticks

In Anaplasma marginale transmission studies conducted on the high semi-arid range of eastern Oregon 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) = (venustus) developed the disease. Dermacentor andersoni appears to be the principal vector on this range.

Alternate JournalAm. J. Vet. Res.
Full Text
PubMed ID557939