서귀포에서 채집한 쯔쯔가무시 매개 털진드기 분포
Distribution of Chigger Mites as Tsutsugamushi Vectors Sampled in Seogwipo
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Orientia tsutsugamushi 감시를 위한 털진드기 분포를 제주도 서귀포시 일원에서 조사 하였다. 총 20개의 채집기를 이용하여 논, 밭, 수로, 초지(4개 지점)에서 털진드기 유충을 9∼11월까지 매주 1회씩 채집한 결과 개체수는 3종 51마리가 채집되었다. 설치류에 기생하는 털진드기 분포 감시를 2018년 3월부터11월까지 한달에 한번씩 9개월 동안 논, 수로, 밭, 저수지, 야산(5개 지점)에서 Sherman traps 각 20개씩 100개를 설치해서채집한 결과 64마리의 들쥐를 포획해서 trap index 0.08 이였다. 포획된 들쥐는 한 종류인 등줄쥐(Apodemus agrarius)로만확인되었다. 시기별로는 4월에 15마리로 가장 많았고, 포획된64마리의 야생 설치류에서 털진드기가 436마리 채집되어chigger index는 6.8이었으며 시기별 chigger index는 11월46.0로 가장 높았고, 7월에 6.8, 6월에 4.6 순으로 나타났다. 채집기와 포획된 설치류에서 채집한 털진드기 총 487마리에 대한쯔쯔가무시 보유여부를 확인하기 위해서 PCR을 실시한 결과모두 음성으로 나타났다.
Abstract
We investigated the distribution of chigger mites in Seogwipo, Jeju Island to conduct surveillance for the presence of Orientia tsutsugamushi. Using a total of 20 samplers, chigger mite larvas were sampled weekly from September to November in Rice field, Field, Waterway, and Glass field (4 locations), and we found up to 51 larvas of 3 different species of chigger mites. 64 field mice were captured when sampling for chigger mite-infested rodents in rice fields, waterways, fields, reservoirs and hills (5 locations) for 9 months from March, 2018 to November, using 100 Sherman traps with placing 20 traps in each location, and in each location the trap index was 0.08. Only back-striped field mice (Apodemus agrarius) were captured one at a time. They were most frequently captured in April with 15 mice, and then 436 chigger mites were collected from the total of 64 captured wild rodent, showing a chigger index of 6.8. The chigger index was the highest in November at 46.0, followed by 6.8 in July and 4.6 in June. PCR was performed to investigate if there were any O. tsutsugamushi hosts among the 487 chigger mites sampled from the captured rodents and this turned out to be negative.
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