Tsutsugamushi disease is caused by Rickettsia tsutsugamushithrough the bite of vector chigger mite on human.
恙虫病是由感染恙螨幼虫叮咬人体传入恙虫病立克次体所致的急性传染病。
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But the symptoms and pathological changes were not obvious in mice injected with specimens from patients, rats and chigger mites, so Rickettsiatsutsugamushi (Rt) could not easily be detected.