1991年4～8月在内蒙古大兴安岭对莱姆传播媒介全沟硬蜱季节消长、带菌及人群自然感染季节分布等进行调查。结果证明全沟硬蜱是当地蜱类的优势种,从5月上旬发现蜱开始活动,6月上旬为蜱密度高峰期,占总捕数的36％,7月末蜱基本消失。用直接荧光抗体法查蜱带菌率,从采集的549只全沟硬蜱中,检出带菌蜱164只,自然带菌率为29.9％。间接荧光抗体法检测63例被蜱叮咬者血清,其中13例抗体阳性,阳性率为20.6％。本次调查表明,内蒙古大兴安岭林区5～6月为莱姆病媒介全沟硬蜱活动繁殖的高峰期。对63例被蜱叮咬者进行流行病学调查,被蜱叮咬季节与全沟硬蜱季节消长曲线相一致。 From April to August 1991, the seasonal distribution of Ixodes iridiformis tick ticks in the Daxinganling Mountains, Inner Mongolia, and the seasonal distribution of infection and natural infection of the population were investigated. The results showed that Ixodes nigricans was the dominant species of local ticks, and ticks started to be detected in early May. The tick density peaked at the beginning of June, accounting for 36% of the total number of ticks. At the end of July, ticks basically disappeared. Toxoplasma gondii infection rate was detected by direct fluorescent antibody assay. 164 ticks were collected from 549 ticks collected in this study. The rate of natural carriage was 29.9%. Indirect fluorescent antibody test detected 63 cases of tick bite sera, including 13 cases of antibody positive, the positive rate was 20.6%. The survey shows that the Daxinganling forest in Inner Mongolia from May to June for Lyme disease vector Ixodes tick peak activity of reproduction. Epidemiological investigation of 63 cases of tick bites was made consistent with the season of tick bites and the season-long curve of ticks.