Olson J G, Bourgeois A L, Fang R C
Trans R Soc Trop Med Hyg. 1982;76(1):85-8. doi: 10.1016/0035-9203(82)90027-x.
Larval Leptotrombidium deliense were recovered from live-trapped Suncus murinus, Rattus rattus and R. norvegicus captured in the Pescadores Islands of Taiwan during 1976 and 1977. Weekly and monthly indices of chigger infestation expressed as a percentage of hosts infested and the number of chiggers per host for S. murinus and Rattus spp. were calculated. Close correlations were observed between monthly indices of L. deliense measured for S. murinus and Rattus spp. and the number of laboratory-confirmed cases of scrub typhus per month. Weekly indices from S. murinus correlated more closely with number of cases than did weekly indices from Rattus spp. The critical level of chigger infestation necessary for a single case of scrub typhus in a month was estimated at 0.69 chigger per S. murinus and 0.68 chigger per Rattus spp. The weekly index of chigger infestation necessary for a single case of scrub typhus during a week was calculated at 0.47 chiggers per shrew. Critical levels of chigger infestations expressed as percentages of hosts infested were not calculated.
1976年至1977年期间，在台湾澎湖列岛通过活捉的臭鼩鼱、黑家鼠和褐家鼠身上发现了地里纤恙螨幼虫。计算了以受感染宿主百分比表示的恙螨感染的每周和每月指数，以及臭鼩鼱和家鼠属每只宿主身上的恙螨数量。观察到臭鼩鼱和家鼠属每月地里纤恙螨指数与每月实验室确诊的恙虫病病例数之间存在密切相关性。臭鼩鼱的每周指数与病例数的相关性比家鼠属的每周指数更密切。估计每月每只臭鼩鼱有0.69只恙螨、每只家鼠属有0.68只恙螨是一个月内出现一例恙虫病所需的恙螨感染临界水平。计算出一周内出现一例恙虫病所需的恙螨感染每周指数为每只鼩鼱0.47只恙螨。未计算以受感染宿主百分比表示的恙螨感染临界水平。
