Aguirre D H, Gaido A B, Vinabal A E, De Echaide S T, Guglielmone A A
Instituto Nacional de Tecnología Agropecuaria, Estación Experimental Agropecuaria Salta, Argentina.
Parasite. 1994 Dec;1(4):405-7. doi: 10.1051/parasite/1994014405.
Nine splenectomised calves were infested with dissimilar numbers of adult Boophilus microplus ticks 72 h after collection as engorged nymphs from three non splenectomised calves with different levels of Anaplasma marginale rickettsaemia. Successful transmission of A. marginale appeared to be more dependent on the level of rickettsaemia of the donor calves than on the number of ticks attaching to the splenectomised calves, since infection was transmitted only when the rickettsaemia was 0.3% or greater. Field transmission would thus depend on the rate of tick migration amongst susceptible hosts and the rickettsaemia level of cattle on which the ticks fed previously.
9头脾切除的小牛在从3头不同程度边缘无浆体立克次氏体血症的非脾切除小牛身上收集饱血若蜱72小时后，感染了数量不等的微小牛蜱成虫。边缘无浆体的成功传播似乎更多地取决于供体小牛的立克次氏体血症水平，而非附着在脾切除小牛身上的蜱的数量，因为只有当立克次氏体血症为0.3%或更高时才会发生感染。因此，田间传播将取决于蜱在易感宿主间的迁移率以及蜱先前吸食的牛的立克次氏体血症水平。
