Mahan S M, Peter T F, Semu S M, Simbi B H, Norval R A, Barbet A F
University of Florida/United States Agency for International Development/South African Development Cooperation, Heartwater Research Project, Causeway, Harare, Zimbabwe.
Epidemiol Infect. 1995 Oct;115(2):345-53. doi: 10.1017/s0950268800058465.
The susceptibility of laboratory reared Zimbabwean Amblyomma hebraeum and A. variegatum ticks to infection with geographically distinct Cowdria ruminantium strains was investigated by feeding both species simultaneously on individual sheep infected with one of the four strains (Crystal Springs [Zimbabwe], Ball 3 [South Africa], Gardel [Guadeloupe] and Nigeria [Nigeria]). A. hebraeum ticks demonstrated a high susceptibility to infection with all four C. ruminantium strains. In comparison, A. variegatum were less susceptible to infection with the Crystal Springs and Ball 3 strains (P < 0.001), but showed a similar susceptibility to the Gardel and Nigeria strains. The differences in susceptibility of A. variegatum to infection with the four strains of C. ruminantium correlated with the origin of these strains. The consistently higher susceptibility of A. hebraeum ticks to infection with geographically different C. ruminantium strains may be one explanation for the observation that heartwater is a more serious problem where A. hebraeum is the vector of the disease.
通过让实验室饲养的津巴布韦希伯来花蜱和变异花蜱同时叮咬感染了四种菌株（水晶泉株[津巴布韦]、鲍尔3株[南非]、加德尔株[瓜德罗普岛]和尼日利亚株[尼日利亚]）之一的个体绵羊，研究了这两种蜱对地理上不同的反刍兽考德里氏体菌株感染的易感性。希伯来花蜱对所有四种反刍兽考德里氏体菌株感染均表现出高易感性。相比之下，变异花蜱对水晶泉株和鲍尔3株的感染较不易感（P<0.001），但对加德尔株和尼日利亚株表现出相似的易感性。变异花蜱对四种反刍兽考德里氏体菌株感染易感性的差异与这些菌株的来源相关。希伯来花蜱对地理上不同的反刍兽考德里氏体菌株感染始终具有较高的易感性，这可能是对心水病在希伯来花蜱作为该病传播媒介的地区是一个更严重问题这一观察结果的一种解释。
