Studies on Tsutsugamushi Disease in Gifu Prefecture

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Other Title
  • 岐阜県における志虫病の研究
  • 岐阜県における恙虫病の研究-2-媒介ツツガムシの推定
  • ギフケン ニ オケル ツツガムシビョウ ノ ケンキュウ 2 バイカイ ツツガム
  • 2. A Speculation on the Vector
  • 第2報媒介ツツガムシの推定

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Description

We trapped wild rodents at a field near River Kiso in Sakahogi-town, Gifu Prefecture, Japan, to examine the possession of Rickettsia tsutsugamushi (Rt) and antibody in wild rodents and the possession of Rt in trombiculid mites parasitized in wild rodents, in November to December 1984.<BR>Fifty percent of rodents trapped in Nobember and 62.5% in December had Rt.Antibody-positivities were 60.0% in Nobember and 62.5% in December, antibody or Rt positivities were 70.0% in Nobember and 75.0% in December.Specificities of antibody were prominent to Karp strain with cross-reactivities to Kato strain.<BR>Rt-positivities were examined in trombiculid mites collected from 3 wild rodents.The positivities in Leptotrombidium fuji and in Gahrliepia saduski were both 0% out of 77 and 196, respectively. Two L. pallidum out of 234 in Exp. 1, and 3 out of 500 in Exp. 2, possessed Rt. The mean Rt-positivity was 0.73%. In the case of Exp. 2, analysis according to Poisson distribution showed that one more mite possessed Rt in the probabiliry of 24.6%. Therefore the mean positive rate was corrected to 0.83% in this case.On the contraly, the hypothesis that L.scutellare possessed Rt was negliglible in the analysis because the porobability was very low (<1%). In the conclusion, L. pallidum possessed Rt in the probability between 0.73 to 0.83%.The strain of Rt isolated from mites were resemble mainly to Karp strain and secondaly to Kato strain in the analysis of antibody.

Journal

  • Kansenshogaku Zasshi

    Kansenshogaku Zasshi 59 (11), 1142-1148, 1985

    The Japanese Association for Infectious Diseases

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