国内部分省市肉兔及蜱虫携带土拉杆菌的流行病学调查

Epidemiological Investigation of Francisella tularensis Transmitted by Rabbits and Ticks in Some Provinces of China

本调查旨在探明土拉杆菌在国内部分省份的流行情况。利用本实验室建立的土拉杆菌通用及亚种PCR检测研究方法,对国内肉兔饲养密度比较大的省份和牛羊存栏的部分省市开展了肉兔和蜱虫中土拉杆菌的检测,并对阳性样本进行了土拉杆菌亚种的鉴定和基因测序验证。研究结果表明,肉兔肝脏组织和牛羊携带蜱虫中土拉杆菌DNA检测阳性,其中218份肉兔样本中12份阳性(阳性率5.5%),490份蜱虫样本中15份阳性(阳性率3.1%);从地区分布来看,山东、河南、四川肉兔病料检测阳性,云南、山东蜱虫阳性率高;PCR检测显示其亚种为F.h,为土拉杆菌毒力较强的亚种。本次调查显示土拉杆菌在肉兔、蜱虫中存在,山东、云南地区存在土拉杆菌病公共卫生安全风险,应引起有关科研院校、医疗单位和政府部门的高度重视。

The aim of this investigation was to find out the prevalence of Francesella tularensis in some provinces of China.Using the general and subspecies PCR detection method for Francesella tularensis established in our laboratory,PCR detection of Francesella tularensis in rabbits and ticks was carried out in provinces with high-density rabbits feeding and some provinces and cities with sheep and cattle stock.The results showed that DNA detection of Francesella tularensis from rabbit tissues and ticks carried by cattle and sheep was positive.12 out of 218 rabbit samples were positive(5.5%positive rate),and 15 tick samples were positive(3.1%)of 490 tick samples.In terms of geographical distribution,most of the positive rabbit samples were from Shandong,Henan and Sichuan province,however,ticks collected from Yunnan and Shandong province showed a higher positive rate.PCR detection showed that Francesella tularensis subspecies in this investigation was F.h,which was a subspecies with strong toxicity.This investigation revealed that Francesella tularensis presented in rabbits and ticks,public health and safety risks of Francesella tularensis existed in Shandong and Yunnan province,which should be paid more attention by the relevant scientific research institutions,medical institutions and government departments.