Flach E J, Ouhelli H, Waddington D, Oudich M, Spooner R L
Département de Parasitologie, Institut Agronomique et Vétérinaire Hassan II, Rabat, Morocco.
Vet Parasitol. 1995 Oct;59(3-4):177-88. doi: 10.1016/0304-4017(94)00760-a.
A longitudinal epidemiological investigation of tropical theileriosis was carried out in an endemic region of Morocco during the 1991 disease season. This involved approximately 220 cross-bred cattle on 15 farms. Data were collected on the frequency of existing infections, the size of the vector tick population and the incidences of new infections and clinical disease, and these were then analysed using statistical models. The prevalence of subclinically infected carriers of Theileria annulata, the number of adult Hyalomma detritum, the vector, and the probability of becoming newly infected with T. annulata increased significantly with the age of cattle, although the age effect on new infections may be a result of increased tick numbers on older animals. The probability of clinical disease in newly infected cattle was not significantly influenced by age or by the number of adult ticks, but was significantly positively associated with the cattle population on the farm. The number of H. detritum nymphs counted on cattle in the autumn was related significantly to the previous adult tick count on the same animal.
1991年疾病流行季节，在摩洛哥的一个地方性流行区对热带泰勒虫病进行了纵向流行病学调查。该调查涉及15个农场的约220头杂交牛。收集了现有感染频率、媒介蜱虫种群数量以及新感染和临床疾病发病率的数据，然后使用统计模型对这些数据进行分析。环形泰勒虫亚临床感染携带者的患病率、媒介成年小亚璃眼蜱的数量以及新感染环形泰勒虫的概率均随牛的年龄显著增加，不过年龄对新感染的影响可能是由于老龄动物身上蜱虫数量增加所致。新感染牛发生临床疾病的概率不受年龄或成年蜱虫数量的显著影响，但与农场牛群数量显著正相关。秋季在牛身上计数的小亚璃眼蜱若虫数量与同一动物先前的成年蜱虫计数显著相关。
