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首页> 外文期刊>Journal of Medical Entomology >A prospective cross-over field trial shows protection of lemon eucalyptus extract against tick bites.
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A prospective cross-over field trial shows protection of lemon eucalyptus extract against tick bites.

机译：一项前瞻性交叉田间试验表明，柠檬桉树提取物可防止tick虫叮咬。

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摘要

Ixodes ricinus can transmit several microorganisms, out of which Borrelia burgdorferi and tickborne encephalitis (TBE) virus are the most important pathogens in humans. A lemon eucalyptus extract (Citriodiol) has been shown to be a natural repellent against mosquitoes, stable flies, and midges. We have investigated whether the use of the extract would reduce the number of attached I. ricinus ticks in humans. A volunteer sample of 111 individuals was recruited among healthy, outdoor active adults living in two highly I. ricinus-infested areas in Stockholm, Sweden. They were randomly divided into two groups: one group applied the Citriodiol spray daily for two weeks to the lower extremities, whereas the other group was instructed not to use any type of repellent on any part of the body. After two weeks, the scheme was reversed. All volunteers filled in a daily diary, giving information about outdoor activities and the number of observed, attached, or not yet attached ticks, including the anatomical location of the ticks found. Forty-two attached ticks were reported during the weeks when the Citriodiol spray was used, and 112 were reported when it was not. The median number of reported attached ticks per person decreased from 1.5 (range, 0-9) to 0.5 (range, 0-2; P<0.05) during the weeks when the repellent was used. The number of reported attached ticks noted below the waist was 13/42 (31%) during the period when the spray was used and 73/112 (65%) when no spray was used (P<0.001). No evident redistribution of attached ticks from protected areas to unprotected areas was seen. Citriodiol may become a useful means in reducing the number of tick bites and thereby tickborne infections, although additional studies are warranted.
机译：稻瘟病可以传播多种微生物，其中伯氏疏螺旋体和壁虱脑炎（TBE）病毒是人类最重要的病原体。柠檬桉树提取物（柠檬糖醇）已被证明是天然的驱蚊剂，可抵抗蚊子，苍蝇和蚊虫。我们已经研究了提取物的使用是否会减少人体附着的蓖麻毒tick的数量。在居住于瑞典斯德哥尔摩两个高度受蓖麻毒素感染的地区的健康，户外活动的成年人中，招募了111个人的志愿者样本。他们被随机分为两组：一组每天在下肢上应用柠檬酸二醇喷雾两周，而另一组被指示不要在身体的任何部位使用任何类型的驱避剂。两周后，该计划被撤销。所有志愿者每天填写日记，提供有关户外活动以及观察到的，附着的或尚未附着的tick的数量的信息，包括发现的tick的解剖位置。在使用柠檬酸二醇喷雾剂的几周内，有42个附着的reported虫报告，而在没有使用的情况下，有112个tick虫报告。在使用驱虫剂的几周内，每人报告的attached虫的中位数从1.5（范围0-9）降低到0.5（范围0-2; P <0.05）。在使用喷雾剂期间，腰部下方记录的已报告attached虫数量为13/42（31％），而在不使用喷雾剂时为73/112（65％）（P <0.001）。没有发现附着的tick从保护区到未保护区的明显重新分布。尽管需要进行更多的研究，但柠檬二醇可能会成为减少in叮咬数量并进而减少tick传播感染的有用手段。

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