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本次调查区位于北纬40°10′～44°43′,东经119°51′～120°25′。调查期间从达乌尔黄鼠 Citellus dauricus、方形黄鼠蚤松江亚种 Citellophilus tesquorum sungaris及角尖眼蚤指名亚种O phthalmopsylla prae fecta prae fecta中共分离出27株鼠疫杆菌。 疫点位于北纬40°18′～40°37′,东经120°10′～120°20′。达乌尔黄鼠的鼠疫F1抗体阳性2份,阳性率为0.13％,从而首次判定调查区内存在鼠疫自然疫源地。
The survey area is located at latitude 40 ° 10 ’~ 44 ° 43’ and longitude 119 ° 51 ’~ 120 ° 25’. During the investigation, 27 strains of Yersinia pestis were isolated from Citellus dauricus, Citellophilus tesquorum sungaris and Ophthalmopsylla praefecta praectactus, which were named subspecies of Dictyostelium. The epidemic lies at latitude 40 ° 18 ’~ 40 ° 37’ and longitude 120 ° 10 ’~ 120 ° 20’ east longitude. Dalueryi rat plague F1 antibody positive 2, the positive rate of 0.13%, which for the first time to determine the existence of plague in the investigation area of natural foci.