山东省部分地区媒介蜱类携带病原体的分子流行病学调查

MOLECULAR EPIDEMIOLOGICAL INVESTIGATION OF PATHOGENS CARRIED BY TICKS IN SOME AREAS OF SHANDONG PROVINCE

为探究山东省部分地区蜱类及其携带病原体情况,本研究对2021—2022年在山东省7个地区采集的游离和寄生蜱标本进行形态学鉴定;并对5种常见蜱传病原体进行PCR检测,统计其病原体的自然携带情况,并对阳性样本的病原体序列进行系统发育分析。结果显示,采集到的蜱虫样本包括2属4种,分别包括长角血蜱145只、嗜群血蜱2只、铃头血蜱2只和血红扇头蜱5只。PCR检测结果显示携带斑点热群立克次体34份,总阳性率为22.08%;携带无形体样本29份,总感染率为18.83%;泰勒虫和伯氏疏螺旋体总感染率分别为5.84%和0.65%,所有样本均没有检测到回归热螺旋体感染。结果提示,长角血蜱为山东省内优势蜱种,不同蜱种内存在较高病原体感染率,应加强当地对蜱虫监测和防控宣传。

To explore pathogens in several tick species in endemic areas of Shandong province,unfed ticks and parasitic ones were collected in seven areas of Shandong province during 2021-2022 and morphologically identified.Five common tick-borne pathogens were detected by PCR with universal primers on the tick samples and phylogenetic analysis based on the sequences from positive pathogens were also performed as well.The results showed that the collected tick samples included 2 genera and 4 species,respectively comprising 145 of Haemaphysalis longicornis,2 of Hae.concinna,2 of Hae.campanulate,and 5 of Rhipicephalus sanguineus.A total of 34 collected ticks were found with spotted fever group Rickettsia infection,with a total positive rate of 22.08%,29 samples carried Anaplasma,with a total infection rate of 18.83%,the total infection rate of Theileria and Borrelia burgdorferi were revealed as 5.84%and 0.65%,respectively,and no positive samples were detected for Borrelia recurrentis.In conclusion,Hae.longicornis was shown as the dominant tick species in the sampling areas in Shandong province,and various pathogens were found harbored in different tick species.Local surveillance and awareness of tick-borne diseases should be strengthened for the purpose of efficient prevention and control measures.