中文摘要：

目的调查云南省黄胸鼠Rattus flavipectus和褐家鼠R.norvegicus体表寄生蚤的感染情况,为云南省鼠疫防控提供科学依据。方法 2012年7月—2013年11月,在云南省34个县市随机选取采样点,笼捕法采集黄胸鼠和褐家鼠,收集并鉴定体表寄生蚤,统计宿主和蚤类物种组成、染蚤率、蚤指数,并根据蚤种组成进行分层聚类。结果采集鼠类842只,其中黄胸鼠714只、褐家鼠128只;共检获体表寄生蚤3227匹,涵盖10个已知蚤种,其中,印鼠客蚤Xenopsylla cheopis和缓慢细蚤Leptopsylla segnis为优势物种。黄胸鼠和褐家鼠的染蚤率分别为48.88%和53.91%,2种鼠的总体蚤指数为3.83匹/只,其中有16个县市的印鼠客蚤指数〉1。聚类分析将所有样点聚成3大支系：A支系印鼠客蚤占优势,主要分布于云南省南部地区;B支系优势种不明显或具有其他蚤种,分布于云南省中部地区;C支系缓慢细蚤占优势,分布于云南省北部地区。结论印鼠客蚤和缓慢细蚤是云南省主要蚤种,在接近半数地区印鼠客蚤指数〉1,防疫形势非常严峻。云南省黄胸鼠和褐家鼠体表蚤区系组成具有一定的地带性,其中南部地区为印鼠客蚤优势分布区,可视为媒介监测和防控的重点区域。

英文摘要：

Objective To provide scientific basis for plague control in Ynnnan province, China, we investigated the flea infestation on Rattus flavipectus and R. norvegicus. Methods The investigation was conducted between July 2012 and No- vember 2013. Rats were live trapped from 34 counties in Yunnan. The compositions of rats and fleas, the flea prevalence, and the average flea abundance were calculated; the counties were clustered according to the flea compositions. Results A total of 842 rats （714 R. flavipectus and 128 R. norvegicus） were trapped and 3227 fleas were collected. Among of which, 10 flea species were identified, and Xenopsylla cheopis and Leptopsylla segnis were the dominant species. The overall flea prevalence of R. flavipectus and R. norvegicus were 48.88 % and 53.91% , respectively; the average flea abundance of all the rats was 3.83 fleas per host; 16 counties had an average flea abundance over 1. The clustering analysis showed that 34 counties could be divided into 3 clades： elade A with X. cheopis as the dominant flea species; elade B with no dominant species or with species other than X. cheopis and L. segnis; clade C with L. segnis as the dominant flea species. Conclu- sion X. cheopis and L. segnis were the dominant flea species on rats in Yunnan, and nearly half of the 34 counties had av- erage flea abundance over 1, indicating a poor plague control situation in Yunnan. The flea infestations on R. flavipectus and R. norvegicus in Yunnan had a considerable zonality ： the southern regions of the province were dominated by X. cheopis and thus should be the key regions for plague monitor and control.