Detection of a spotted fever group rickettsia in Amblyomma cajennense (Acari: Ixodidae) in south Texas.
Detection of a spotted fever group rickettsia in Amblyomma cajennense (Acari: Ixodidae) in south Texas.
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在德克萨斯州南部的 Amblyomma cajennense（螨虫：蜱科）中检测到斑点热群立克次体。
DOI：
10.1093/jmedent/35.4.474
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发表时间：
1998
影响因子：
2.1
通讯作者：
Walker,DH
中科院分区：
文献类型：
--
作者：
Billings,AN;Yu,XJ;Teel,PD;Walker,DH
泰国斑疹伤寒立克次体（TT-118株）是1962年从泰国采集的一批蜱虫和扇头蜱混合感染的蜱虫中分离到的一种致病性不确定的斑点热群立克次体。在这里，我们报告了一个令人惊讶的发现斑点热群立克次体与泰国蜱斑疹伤寒立克次体在Amblyomma cajennense（F.）德州南部的蜱虫对区分立克次体种的3个基因的片段进行序列分析;所有3个测序的基因，17-kDa，glta，andrompA，与其他立克次体相比，与泰国蜱斑疹伤寒立克次体的相似性最高，分别为99.5，99.5和100%。这是在德克萨斯州和美国首次发现的卡金内塞蜱中的立克次体。如果立克次体是致病性的，接触感染的A。cajennenseticks可能会对被这些蜱虫喂养的人造成以前未被认识到的健康风险。
Thai tick typhus rickettsia (strain TT-118), a spotted fever group rickettsia of indeterminant pathogenicity, was isolated from a mixed pool of larvalIxodesandRhipicephalusticks collected from Thailand in 1962. Here we report the surprising finding of a spotted fever group rickettsia with closest sequence homology to the Thai tick typhus rickettsia inAmblyomma cajennense(F.) ticks from south Texas. Sequence analysis was performed on segments of 3 genes that differentiate rickettsial species; all 3 genes sequenced, the 17-kDa,glta, andrompA, when compared with those of other rickettsiae, showed the highest degree of similarity to the Thai tick typhus rickettsia with 99.5, 99.5, and 100% homology, respectively. This is the 1st finding of a rickettsial species in A.cajennenseticks in Texas and the United States. If this rickettsia is pathogenic, exposure to infectedA. cajennenseticks may pose a previously unrecognized health risk to people who have been fed upon by these ticks.