关键词: 三峡库区重庆段, 鼠疫, 预警研究

Abstract: Objective To explore main plague hosts, vectors and plague foci in the second phase water line of the Three Gorges project in Chongqing, and provide scientific basis for plague early warning and control. Methods Investigate the density of rat-shape animals inside and outside of home. The rat-shape animals were anaesthetized to investigate the varieties of parasitical fleas and the infected rate after captured by cage-trap. Identify the captured rat-shape animals and know their population and distribution. Plague F1 antibody was tested in serum samples separated from the blood of anaesthetized rat-shape animals. Search for the dead animals without specific death causes and monitor the plague epidemic situation, and acquire the information about the natural foci and epidemic situation. Results 3 order, 8 families and 27 species of rat-shape animals were found in this area. Among them, Rattus norvegicus, Mus musculus, Rattus flavipectus and Anourosorex squamipes were the dominant species. The average density of rat-shape animals was 1.57%, and the density of them was 1.64% in the room that was a little higher than that of outside(1.51%). 10 340 serum samples of rat-shape animals were tested and no positive results were obtained. 6 species of parasitical fleas such as Xenopsylla cheopis, Monopsyllus anisus, Leptopsylla segnis, Ctenocephalides felis, Palaeopsylla remota and Neopsylla specialis were found. The average rate of rat-shape animals infected with fleas and the total flea index were 6.51% and 0.15, respectively. The results of epidemiology survey and epidemic situation monitoring indicated that there were no plague in mice or human population in the region. Conclusion No plague was found so far in the Three Gorges Reservoir region in Chongqing, but R.flavipectus and X.cheopis were widely distributed in this region. Once the infection sources were introduced, the outbreak of plague would be possible. So there was potential risk for plague in this region, we should pay more attention to it.