关键词: 蝇类, 种群密度, 季节消长, 带菌状况, 致病性大肠埃希菌

Abstract: Objective To investigate species,distribution of flies and the intestinal bacteria borne by the flies in Ningde to provide a basis for controlling flies and preventing infestinal infectious diseases.Methods Using cages to entrap flies in urban and insect nets to catch them outside the urban three times every month,classifying them and then caculating the group density and isolating pathogenic bacteria.Results 115 species were caught belonging to 51 genera and 6 families and the average density of flies was 234.9 per cage with the highest density at garbage dump and slaughter house.Flies were active throughout the year and there were 2 peaks of the density in April-May and October,with bacterium positive rates of five common flies reaching nearly 100%,which accorded with the peak seasons of intestinal infectious diseases.Conclusion Garbage dump and slaughter house are especially notable circumstance and April and October are important seasons for controlling flies and preventing intestinal infectious diseases in Ningde.