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Studies on tsutsugamushi by tullgren's funnel method 3. occurrence of vector trombiculid leptotrombidium pallidum in the neighborhood of patients' houses



Studies on tsutsugamushi by tullgren's funnel method 3. occurrence of vector trombiculid leptotrombidium pallidum in the neighborhood of patients' houses



Medical Entomology and Zoology 39(1): 13-17



The presumption that Leptotrombidium pallidium, the most probable vector trombiculid of tsutsugamushi disease in Nagano Prefecture [Japan] would occur in the vicinity of patients' houses and would constitute a source of infection was determined by the following procedures. Housing lots including the rear and front gardens, the side of pathways, grasslands, cultivated or abandoned fields and banks of these fields were selected in the neighbourhood of the houses of seven patients who contracted the diseases in 1986. From the selected spots with living signs of wild rodents, 10 or 15 soil samples, each with a volume of ca. 2,000 cm3, per one patient's housing area were taken and examined for the presence of chiggers by the Tullgren's funnel method. The samplings were carried out during the period from November 17 to December 3, 1986. L. pallidum larvae were frequently found from the samples taken at the housing lots and paddy banks close to the patients' houses. No appreciable differences were observed between the environmetal conditions of these patients' houses and non-patients' ones. The possibility that such penetrating distribution of vector trombiculid as observed in this study is common in other endemic foci was suggested as an alarm for the prevention of tsutsugamushi disease.

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Accession: 006523386

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