关键词: 恙虫病, 自然疫源地, 立克次体, 宿主动物

Abstract: Our investigation in 1994 found that Suncus murinus was the dominative species at Xisha islands. which constituted 91.38% at Yongxing island and carried parasitic chiggers index and rate were 2.66 and 48.88% respectively,the highest record, Among the parasitic chiggers,the Leptoerombidium deliense was the dominative species as the main vector of sourthen Tsutsugamushi disease,making the proportion of 86.65%,Serum tests indicated that Richettsia tsutsugamushi (Rt) of host animals was infected at high rate,especially in Xisha islands population,and the serum types of the antibody were belong to Karp, Kato and Gilliam. The PCR technology of molecular epidemiology ways inspected out that medium parasitic chiggers and Suncus murinus,of host animals carried some Rt pathogens. According to the record of military hospital at Xisha island, 30～40 patients with typical Tsutsugamushi disease symptom were treated every year that happened mainly at autum and winter. This proved completely that Xisha islands be the Tsutsugamasshi disease natural infectious focus with Suncus murinus, the main host animal.