MAINTENANCE OF THEILERIA-PARVA-PARVA INFECTION IN AN ENDEMIC AREA OF KENYA
MAINTENANCE OF THEILERIA-PARVA-PARVA INFECTION IN AN ENDEMIC AREA OF KENYA
复制标题
DOI：
10.1017/s0031182000049787
复制
发表时间：
1986-08-01
期刊：
影响因子：
2.4
通讯作者：
CUNNINGHAM, MP
中科院分区：
文献类型：
--
作者：
YOUNG, AS;LEITCH, BL;CUNNINGHAM, MP
对肯尼亚维多利亚湖岸边某流行区细小芽孢杆菌感染的维持情况进行了野外和实验室研究。在当地的瘤牛中检测到高发的细小t型虫和变形t型虫抗体和红细胞内螺旋体。野外采集的蜱尾鼻头蜱的平均感染率为1.1%。大部分的感染是由野蜱对易感牛的施放引起的。5头牛，年龄都在1.5岁左右，从当地所有者那里购买并运到实验室。所有5例患者均有抗细小t和变形t的振荡抗体滴度，并在随后的13个月内消除了肠道感染。未感染的尾尾绦虫若虫在运至穆古加后0.3、6、9和13个月分别施于牛，当施100只尾尾绦虫成虫时，23批中有18批将细小绦虫感染给牛。蜱批的感染率通常较低，每只蜱感染1只唾液腺腺泡。因此，首次在自然感染的牛中发现了细小t型虫的频繁携带状态，这种携带状态很可能对维持田间细小t型虫感染具有重要意义。
The maintenance of Theileria parva parva infection in an endemic area of Kenya on the shore of Lake Victoria was studied in the field and laboratory. High prevalence of antibodies against T. parva and T. mutans and intra-erythrocytic piroplasms were detected in local zebu (Bos indicus) cattle. The mean infection rate of Theileria parasites in the tick, Rhipicephalus appendiculatus, in field collections was 1.1%. Most of the infection was attributed to T. parva parva by application of field ticks to susceptible cattle. Five cattle, all about 1.5 years old, were purchased from local owners and transported to the laboratory. All five had oscillating antibody titres against T. parva and T. mutans and had patent theilerial infections during the subsequent 13 months. Uninfected R. appendiculatus nymphs were applied to cattle at 0.3, 6, 9 and 13 months after transport to Muguga, and 18 out of 23 batches transmitted T. parva parva infection to cattle when 100 resultant R. appendiculatus adults were applied. Infection rates in the tick batches were usually low, with 1 salivary gland acinus infected/tick. Hence, a frequent carrier state of naturally infected cattle has been demonstrated for T. parva parva for the first time, and it is likely that this carrier state is of great importance in maintenance of T. parva parva infection in the field.