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首页> 外文期刊>Journal of Medical Entomology >Ultrastructure of Presumed 'Candidatus Rickettsia Andeanae' in Amblyomma maculatum (Acari: Ixodidae)
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Ultrastructure of Presumed 'Candidatus Rickettsia Andeanae' in Amblyomma maculatum (Acari: Ixodidae)

机译：斑纹盲mb中假定的“美洲立克次体立克次体”的超微结构（Acari：Ixodidae）

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摘要

Amblyomma maculatum Koch, 1844 (also known as the Gulf Coast tick) is found in parts of the Americas, including the central and southern United States. Its primary importance is as the vector of Rickettsia parkeri, a spotted fever group rickettsia that causes an illness similar to, but milder than, Rocky Mountain spotted fever. A second spotted fever group rickettsia, "Candidatus Rickettsia andeanae," was detected in Gulf Coast ticks approximately 10 yr ago. However, the significance of this organism, including pathogenicity, has not yet been well-characterized. Here, we use transmission electron microscopy to describe bacteria within the tissues of A. maculatum ticks that were positive by polymerase chain reaction assay for "Ca. R. andeanae." In ultrathin sections of unfed A. maculatum adult females, we found evidence of bacteria with morphological features consistent with spotted fever group rickettsiae, including small size (approximate to 0.3 by 0.9 mu m), a halo zone (electron-lucent layer around the bacterium), and a trilaminar cell wall. In female ticks, bacteria were present in granular salivary glands and ducts, foregut, Malpighian tubules, nerve trunks, and reproductive tissue. These findings demonstrate evidence of "Ca. R. andeanae" in situ and contribute to our understanding of this novel rickettsia in A. maculatum
机译：在美洲的部分地区（包括美国中部和南部）发现了1844年的斑mb（科布）（也称为墨西哥湾沿岸壁虱）。它的主要重要性是作为立克次氏体立克次体的媒介，立克次体是立克次体发斑立克次氏体，其病害与落基山斑热相似但较轻。大约在十年前，在墨西哥湾沿岸s中发现了第二个发烧的立克次氏体立枯病，即“立克次体立克次体”。但是，这种生物的重要性，包括致病性，尚未得到很好的表征。在这里，我们使用透射电子显微镜来描述通过“安第斯山毛虫”的聚合酶链反应检测为阳性的黄斑mac组织中的细菌。在未喂食的黄斑曲霉成年雌性的超薄切片中，我们发现了具有与斑点发烧立克次体一致的形态特征的细菌的证据，包括小尺寸（约0.3 x 0.9微米），一个晕圈区（细菌周围的电子透明层） ）和三层细胞壁。在雌性壁虱中，细菌存在于唾液颗粒和唾液管，前肠，马尔皮基小管，神经干和生殖组织中。这些发现证明了原位“ Ca. R. andeanae”的证据，并有助于我们对黄斑曲霉中这种新型立克次氏体的理解。

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