关键词: 媒介生物, 密度, 季节消长, 调查

Abstract:

Objective To learn the species of biological vector and its pattern of variation with seasons in Ankang city for providing data for the control and prevention of the vector-born diseases. Methods The surveillance sites were set up in the light of “ The National Plan for the Survei11ance of Biological Vector”, where the species and densities of vectors like mosquitoes, f1ies, mice and cockroach were investigated by way of manual mosquito-catching trap, cage-trapping, paste-trapping and rat trapping, respective1y. Results It was found that there were 6 species and 4 genuses of mosquitoes in Ankang city, of which Armigeres subalbatus was the dominant，accounting for 41.06％, followed by Anopheles sinensis (19.69％) and Culex tritaeniorhynchus (17.48％). The density of mosquitoes reached its peak in late August. There were 2 families of flies, including 8 species and 8 genuses, in the district, of which Musca sorbens was the dominant specie, accounting for 48.68％, followed by M. domestica and Lucilia sericata and Chrysomya megacephala, which accounted for 26.78%, 9.55%, 4.84% respectively, with the density of flies highest of the year in July. Two families of the cockroaches, including 2 species and 2 genuses were found in the region, with Periplaneta americana (51.42％) being the dominant species, followed by Blattella germanica (48.58％)，and their density peak in the region was reached in November. The rat-shape animals belonging to 3 species and 3 genuses of 1 fami1y were identified in the area, with the dominant species being Rattus norvegicus (90.34%), followed by Mus musculus (6.90%), and their peak density was seen in September and October of the year. Conclusion It was found that there was a high density of the biological vector in the Ankang city. It is suggested that the government take comprehensive measures for its control and prevention to reduce the density of the biological vector to a level that meets the control standards of national health cities, realizing an effective control and prevention of the outbreak and prevalence of the vector-born diseases.

Key words: Vector, Density, Seasonal fluctuation, Investigation