Abstract: Abstract: Objective   To understand the density and distribution of the main vector organisms in Ma'anshan City during the flood disaster for scientific evidences to take corresponding effective measures against the infection. Methods   The density of mosquitoes, flies and rodents was investigated in the sites of temporary resettlement and villages where victims returned to and surrounding farmlands in Hanshan County and Hexian County with severe flood disasters in Ma'anshan City, and calculate the media density and path index. Results   The average density for mosquito was 34.27 captured by each lamp during the night. Culex tritaeniorhynchus were most seen, which accounted for 67.11% (253/377) of the total mosquitoes trapped. The route index for the mosquito was 2.40 places/km. Average density for the fly was 6.40/cage, with the highest in the farmer's market (11.33/cage). The rodents were not captured by night-trap method, and found in 9 places by tracks. The path index was 7.8/km. Conclusion   The density of vector organisms caused by flood disasters is at a high level in Ma'anshan City. The results suggest that it is necessary to pay attention to the prevention and control of vector organisms during the flood disaster and maintain the environmental sanitation after disaster.

Key words: Flood disaster, Vector organisms, Density survey, Ma'anshan City