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１９９４年在西沙群岛调查发现，宿主动物以食虫目臭（Ｓｕｎｃｕｓｍａｒｉｎｕｓ）为优势种群，其在永兴岛占９１．３８％，带恙螨指数和带螨率分别为２．６６和４８．８８％，亦最高；恙螨中以作为南方恙虫病主要媒介的地里纤恙螨为优势种，占８６．６５％。血清学试验显示，西沙人群，尤其宿主动物的恙虫病立克次体（Ｒｔ）感染率很高，抗体分型属Ｋａｒｐ、Ｋａｔｏ和Ｇｉｌｌｉａｍ血清型。应用分子流行病学方法──ＰＣＲ技术，检测出媒介恙螨及宿主动物（臭）体内均携带有一定数量的Ｒｔ病原。据西沙驻军医院记载，每年收治有典型恙虫病症状病人３０～４０例，患者秋冬季居多，证实西沙群岛存在以臭为主要宿主动物的恙虫病自然疫源地。
A survey in the Xisha Islands in 1994 showed that the dominant species of the host animals, Suncusmarinus, accounted for 91.38% of the population in Yongxing Island, with chigger mites index and banding rates of 2.66 and 48.88, respectively %, The highest; the chigger mites in southern tsutsugamushi disease as the main medium of ground chigger mites dominant species, accounting for 86.65%. Serological tests showed that Rickettsia tsutsugamushi (Rt) infection rate in Xisha population, especially in host animals, was very high. The antibody typing belonged to Karp, Kato and Gilliam serotypes. Using molecular epidemiology-PCR technique, it was detected that both vector chigger mites and host animals (stinky) carry a certain amount of Rt pathogens in vivo. According to records of the Xisha Garrison Hospital, there are 30 to 40 cases of patients with typical tsutsugamushi disease each year. Most of the patients fall and winter, confirming the presence of natural epidemic foci of scrub typhus as the main host animal in the Xisha Islands.