Peterson K J, Raleigh R J, Stroud R K, Goulding R L
Am J Vet Res. 1977 Mar;38(3):351-4.
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.
在1974年和1975年媒介季节期间，于俄勒冈州东部高半干旱地区开展的边缘无形体传播研究中，将对边缘无形体易感的犊牛（主要研究对象）饲养在2个抬高的防蜱平台上。年龄大致相同的对无形体病易感的对照犊牛以及潜伏感染的母牛在平台周围区域放牧。一头潜伏感染的公牛在1975年整个媒介季节与主要研究对象一同饲养在一个平台上。28头主要研究对象未感染无形体病，而30头对照中有15头（50%）被感染。疾病未从潜伏感染的牛只传播给仅暴露于飞行吸血昆虫的主要研究对象，而暴露于落基山蜱（安德逊革蜱=venustus）的对照中有50%感染了该病。安德逊革蜱似乎是该地区的主要传播媒介。
