title: Transstadial and transovarial transmission of Orientia tsutsugamushi in Leptotrombidium imphalum and Leptotrombidium chiangraiensis (Acari: Trombiculidae).
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.
authors: Department of Entomology, U.S. Army Medical Component, Armed Forces Research Institute of Medical Sciences, 315/6 Rajvithi Rd., Bangkok 10400, Thailand.
authors: Siriporn
authors: S
authors: Phasomkusolsil
authors: Panita
authors: P
authors: Tanskul
authors: Supaporn
authors: S
authors: Ratanatham
authors: Pochaman
authors: P
authors: Watcharapichat
authors: Duangporn
authors: D
authors: Phulsuksombati
authors: Stephen P
authors: SP
authors: Frances
authors: Kriangkrai
authors: K
authors: Lerdthusnee
authors: Kenneth J
authors: KJ
authors: Linthicum
mesh_terms: D000818:Animals; D005260:Female; D007303:Insect Vectors / Q000382:microbiology*; D008297:Male; D012285:Orientia tsutsugamushi / Q000302:isolation & purification*; D010053:Ovary / Q000382:microbiology; D013045:Species Specificity; D014324:Trombiculidae / Q000382:microbiology*