Department of Entomology, U.S. Army Medical Component, Armed Forces Research Institute of Medical Sciences, 315/6 Rajvithi Rd., Bangkok 10400, Thailand.
J Med Entomol. 2009 Nov;46(6):1442-5. doi: 10.1603/033.046.0628.
Transovarial transmission of Orientia tsutsugamushi (Hayashi) in laboratory colonies of Leptotrombidium chiangraiensis Tanskul & Linthicum and Leptotrombidium imphalum (Vercammen-Grandjean & Langston) (Acari: Trombiculidae) was studied for two generations. In L. chiangraiensis, the transovarial and filial infection rate was 100% in each generation. Only infected females were produced. In L. imphalum, the transovarial infection rate of the parental generation was 100% but declined to 93.3% in the F1 generation. The overall filial infection rate was 100% in the F1 but was only 62.3% in the F2 generation. In infected lines, only infected females were produced in the F1 generation, but 1.5% of the F2 progeny were infected males. Lower rates of transovarial transmission in L. imphalum may be the cause of the lower natural infection rates found in nature.
恙虫东方体（Hayashi）在实验室种群中的卵传代传播在两个世代中进行了研究。在 L. chiangraiensis 中，每一代的卵传代和幼虫感染率均为 100%。只产生感染的雌性。在 L. imphalum 中，亲代的卵传代感染率为 100%，但在 F1 代下降至 93.3%。F1 的总体幼虫感染率为 100%，但在 F2 代仅为 62.3%。在感染株中，F1 代仅产生感染的雌性，但 F2 代中有 1.5%的感染雄性。L. imphalum 中较低的卵传代传播率可能是自然界中较低的自然感染率的原因。
