关键词: 鼠疫监测, 鼠类种群, 生态工程

Abstract:

　　【Abstract】　Objective　To discuss the influence factors of mice?to?mice plague in Yanchi county of Ningxia. Methods　The density of field mouse was investigated by stratified sampling method. The mice were dissected and the viscera were taken out to do etiology examination by pressing culture method. The fleas collected were separated randomly into groups to do bacteriological analysis. Results　During 2002-2006, the monitoring areas of Meriones unguiculatus plague accounted for 15.93% of total foci areas in Yanchi county. The average density of M.unguiculatus was 11.02/ hm2, and the infection rate of flea and the flea index were 34.17% and 0.85, respectively. Three indexes mentioned above were the highest in 2005 and 2006. There were 4633 field mice captured during 5 years, which belonged to 8 species 6 genus 4 family.  Sixty eight strains of Yersinia pestis were isolated including 57 strains from 3523 mice and 11 strains from 2393 fleas (about 380 groups). Conclusion　M.unguiculatus and M.meridianus are the dominant species. Dipus sagitta, D.sibirica, Cricetulus barabensis and Phoodopus roborovskii are common species, and Cricetulus migratorius and Spermophilus dauricus are the rare species. The outbreak of mice plague has the positive correlation with mice density, infection rate of flea to mice and flea index. The projects about returning farmland to forests and pastures and forbidding grazing periodically increase the outbreak frequency and risk of mice?to?mice plague in the short time in Yanchi county.

Key words: Plague surveillance, Mouse population, Eco?engineering