Tsuda Yoshio, Hayashi Toshihiko, Higa Yukiko, Hoshino Keita, Kasai Shinji, Tomita Takashi, Kurahashi Hiromu, Kobayashi Mutsuo
Department of Medical Entomology, National Institute of Infectious Diseases, Shinjuku-ku, Tokyo, Japan.
Jpn J Infect Dis. 2009 Jul;62(4):294-7.
A mark-release-recapture study of the dispersal ability of blow flies, Calliphora nigribarbis, was conducted in Ikumo-Naka, Ato Town, Yamaguchi Prefecture, Japan in December 2004. A location where a fatal avian influenza outbreak had occurred 1 year previously was selected for the present study. A total of 3,884 C. nigribarbis were collected, 1,915 of which were marked and released from 4 different collection sites during 2 successive days. The recapture rate of the released C. nigribarbis ranged from 0.014 to 0.029 among the collection sites, and the overall recapture rate was calculated as 0.022. Based on the distance between the released site and the recaptured site, the dispersal rate of C. nigribarbis was estimated as 256 m/h on the 1st day and 179 m/h on the 2nd day of the experiment, and the maximum dispersal rate observed in this study was estimated as 500 m/h. Taking into account the active period of C. nigribarbis on a fine day (7 h/day), the distance traveled by C. nigribarbis within a day was estimated as 1,789 and 1,250 m/day on average for the 1st and 2nd days, respectively, and the maximum distance was 3,500 m/day. These results suggest that C. nigribarbis could play a role in the mechanical dissemination of avian influenza virus and spread of the outbreak in Japan.
2004年12月，在日本山口县阿东町生云中地区，对黑须绿蝇（Calliphora nigribarbis）的扩散能力进行了标记重捕研究。本研究选择了1年前曾发生致命禽流感疫情的地点。共采集了3884只黑须绿蝇，其中1915只在连续两天内从4个不同采集点进行标记并释放。释放的黑须绿蝇在各采集点的重捕率在0.014至0.029之间，总体重捕率计算为0.022。根据释放点与重捕点之间的距离，实验第一天黑须绿蝇的扩散速度估计为256米/小时，第二天为179米/小时，本研究中观察到的最大扩散速度估计为500米/小时。考虑到天气晴朗时黑须绿蝇的活动期（每天7小时），黑须绿蝇第一天和第二天每天平均飞行距离分别估计为1789米和1250米，最大距离为3500米/天。这些结果表明，黑须绿蝇可能在禽流感病毒的机械传播以及日本疫情的扩散中发挥作用。
