Studies on Pathogenic Epidemiology and Seasonal Fluctuation of Oestriasis in the Xing'an League, Inner Mongolia
- 生命科学－已发表论文 
1999年 3月～ 2 0 0 0年 2月 ,对来自内蒙古兴安盟牧区、半农半牧区和农区的 5个旗县市 2 2个乡 (苏木、镇 )的 2 16只羊进行了尸体剖检 ,共收集羊狂蝇 1龄、2龄和 3龄幼虫 392 6个 ;对 3群5 5 2只羊进行了临床检查 .结果表明 :羊狂蝇 (Oestrus ovis)蛆是引起兴安盟羊狂蝇蛆病的病原 ;临床检查 ,羊狂蝇蛆病感染率为 92 .2 1% ;尸体剖检 ,羊狂蝇各龄幼虫在羊鼻腔内全年至少寄生 8个月 ,由于重复感染各龄幼虫感染率随季节不同而不同 ,范围在 4 0 .0 0 %～ 95 .0 0 %之间 ,感染强度为 1～14 0个 ;动态监测为羊狂蝇 1、2、3龄幼虫全年均表现出两个感染高峰 ,分别为 6月和 11月、5月和翌年 1月、5月和 8月 ,从而说明兴安盟羊狂蝇繁殖有两个世代 .From March in 1999 to February in 2000, the writer undertook autopsy to 216 sheep at 22 villages and clinical examination to 552 sheep at 3 flock of five counties in Xing'an League, Inner Mongolia, and 3926 each stadium larvae of Oestriasis were collected. The results of the investigation showed that the pathogen of Oestriasis in Xing'an League was O. ovis maggot, and that the infection rate of Oestriasis was 92.21%. The autopsy indicated that the infection rate of each stadium larvae of Oestriasis was 40%~95%, and infection intensity was 1~140. The dynamic surveillance showed that the infection rate of L_1 of O. ovis reached to two peaks in June and November, L_2 in May and the next January, L_3 in May and August respectively, indicating that there were two generations of O. ovis breeding in a year in Xing'an League.