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1 November 2009 Transstadial and Transovarial Transmission of Orientia tsutsugamushi in Leptotrombidium imphalum and Leptotrombidium chiangraiensis (Acari: Trombiculidae)
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Abstract

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.

Siriporn Phasomkusolsil, Panita Tanskul, Supaporn Ratanatham, Pochaman Watcharapichat, Duangporn Phulsuksombati, Stephen P. Frances, Kriangkrai Lerdthusnee, and Kenneth J. Linthicum "Transstadial and Transovarial Transmission of Orientia tsutsugamushi in Leptotrombidium imphalum and Leptotrombidium chiangraiensis (Acari: Trombiculidae)," Journal of Medical Entomology 46(6), (1 November 2009). https://doi.org/10.1603/033.046.0628
Received: 30 December 2008; Accepted: 1 April 2009; Published: 1 November 2009
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