埼玉県の一地域における野鼠寄生および土壌中のツツガムシと Rickettsia tsutsugamushi の分離

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Surveys of trombiculid mites were collected from wild rodents and soil, and isolation of Rickettsia tsutsugamushi (Rt) from the rodents and engorged larvae were performed during the period from December 1984 to November 1985 in the northern part of Saitama Prefecture, Japan, where a patient of tsutsugamushi disease had been reported. The trombiculid mites collected from 114 rodents totalled 12,846 individuals, consisting of 6 species : Leptotrombidium (L.) fuji (36.8%), L. (L.) pallidum (36.8%), Gahrliepia (Gateria) saduski (24.0%), Neotrombicula (N.) japonica (2.1%), L. (L.) miyajimai (0.2%) and Eltonella (E.) ichikawai (0.1%). A total of 224 mites were also recovered from soil. They consisted of 4 species, namely, L. pallidum (40.6%), L. fuji (37.1%), G. saduski (18.3%) and N. japonica (4.0%). The presence of engorged larvae of L. pallidum and G. saduski in rodents reached a remarkably high peak in autumn; L. fuji showed high peaks in autumn and spring. On the other hand, the unfed larvae of these species in soil showed the highest peak in autumn or winter. Rts were isolated from only 60.7% (17/28) of L. pallidum recovered from rodents while none were isolated from the other 696 larvae consisting of 5 species. High ratios of Rt isolation, 33.3-58.9%, were especially successful in autumn and winter. Serological investigation of anti-Rt antibody in the rodents revealed 100% positive in December 1984 and November 1985,respectively, and 20.0-72.7% in other months. These results indicate that L. pallidum may serve as the most important vector of tsutsugamushi disease in this endemic area.
日本衛生動物学会の論文
1993-03-15

埼玉県の一地域における野鼠寄生および土壌中のツツガムシと Rickettsia tsutsugamushi の分離

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