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1992年4～7月,对西藏阿里部分地区进行了土拉菌病调查,结果表明人感染血清阳性检出率平均为2％(7/349);羊血清阳性检出率平均为19％(68/366),个别地区阳性检出率可达50％(17/31)以上。在普兰、噶尔、日土3个县境内的山地高寒荒漠灌丛草原型地带,其海拔高度在4200～4800米处,所采集的银盾革蜱(Dermacentor niveus)3千余只中,分离出13株土拉菌,另外从实验室内孵化出的幼蜱中分离出1株菌,鉴定均为旧大陆变种,按Олсуфъев分类属生物Ⅱ型。从血清学和细菌学角度,首次证实西藏阿里地区存在土拉菌病自然疫源地。
From April to July 1992, a survey of tulamosis was conducted in some areas in Ali, Tibet. The results showed that the positive rate of human infection was 2% (7/349) on average and the positive rate of goat seropositivity was 19% 68/366), positive detection rate in some areas can reach 50% (17/31) or more. In the alpine desert shrub-grassland zone in the three counties of Plan, Gar, and Rizu, the elevation above 4200 ~ 4800 meters and the more than 3000 collected Dermacentor niveus 13 strains of Tulara were isolated. One strain was isolated from the young ticks hatched in the laboratory. All strains were identified as Old Continental Varieties. According to Олсуфъев, they were classified as Group II. From the perspective of serology and bacteriology, it was the first time to confirm the existence of natural epidemic of tularemia in the Ali area of Tibet.