An international journal of the Systematic and Applied Acarology Society, published since 1996
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Systematic & Applied Acarology (2002) 7, 31-34
First Isolation ofOrientia (O.) tsutsugamushi from larvae and reared nymphs of Leptotrombidium (L.) linhuaikongense collected from wild rodents in Fei County, Shandong Province, China 1
YUNXI LIU, ZHANQING YANG, ZHONGTANG ZHAO # , QINYONG WU, ZUOLIN PENG,
ZHONGSHUI MIAO & XIANGRUI MENG
Institute of Military Medicine, Jinan Command, Jinan, 250014, CHINA
# Public Health Institute of Shandong University
During a search for latent vectors of scrub typhus in a focus of the autumn-winter type of this disease, the authors
isolated O. tsutsugamushi from larval and nymphal L. linhuaikongense. Isolated O. tsutsugamushi serotyped
by indirect immunofluorescence assay (IFA). Larval L. linhuaikongense were initially found in May on the
bodies of rodents captured in the field. The infestation reached a peak in August and disappeared in November;
chiggers were thus abundant during summer. Nymphal L. linhuaikongense were reared from larvae collected
from rodents. Two strains of O. tsutsugamushi were isolated from 4 pools of larvae and 3 pools of nymphs,
respectively. This implies that L. linhuaikongense is a potential vector of O. tsutsugamushi, chiefly to rodents
but occasionally to humans, during non-endemic seasons.
Key words: Chigger mite, vector, larvae, nymphs, O. tsutsugamushi, natural infection.
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Last updated 15 Jul. 2002
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