Abstract: Objective To investigate the populations and carried pathogens of plague-related host animals and vector fleas in Yunyang county of the Three Gorges Reservoir Area, and to understand the potential risk of plague occurrence in this region. Methods In April 2018, an investigation was conducted in the cultivated land and residential areas of Yunyang county, Chongqing. Rodents were captured by cage trapping method. Rodents and parasitic fleas collected by comb inspection were identified. Rodent blood was collected for serological testing. Results A total of 8 species of rodents were captured, the total rodent density was 2.52%, capture rate. The indoor and outdoor dominant species were Rattus tanezumi and Apodemus agrarius, respectively. The flea-carrying rate was 50.46% and the total flea index was 4.24, with the dominant flea species Leptopsylla segnis. The free flea index was 0.001. The plague serum antibody was not detected. Conclusion There might be a risk of local epizootic risk with imported plague in Yunyang county of the Three Gorges Reservoir Area, since there exists plague host animal and vector fleas. It implies the need for epizootic plague surveillance program in the county.

Key words: Plague, Host animal, Vector flea, Investigation

摘要： 目的 调查三峡库区云阳段鼠疫相关宿主动物和媒介蚤类的种群及携带病原体情况，了解当地发生鼠疫的潜在风险。方法 2018年4月，在重庆市云阳县分耕作地和居住区开展调查，采用鼠笼法捕鼠，对捕获鼠类及梳检蚤类进行分类鉴定，采集捕获鼠血进行血清学检测。结果 共捕鼠8种，总鼠密度为2.52%，室内、外优势鼠种分别为黄胸鼠和黑线姬鼠；鼠体染蚤率为50.46%，总蚤指数为4.24，缓慢细蚤为优势蚤种，游离蚤指数为0.001；鼠疫血清抗体检测均为阴性。结论三峡库区云阳段在有鼠疫病例输入的情况下，有发生本地传播的风险，应继续加强相关监测，做好防控工作。

关键词: 鼠疫, 宿主动物, 媒介蚤类, 调查