Loh In Kyu, Kim Jae Joo, Hyun Jeong Jun, Namgoong Teak
School of Public Health, Seoul National University, Seoul, Korea.
Kisaengchunghak Chapchi. 1969 Jun;7(1):1-5. doi: 10.3347/kjp.1969.7.1.1.
In this study the authors observed the status of water contamination by crayfish, Cambaroides similis, either alive or dead infected with Paragonimus westermani. The crayfish used as materials were infected heavily with metacercariae of Paragonimus westermani. The live crayfish were kept in water for a long time, and then the sediments of the water were examined to find out whether or not the liberation of the metacercariae from the body of the crayfish had caused contamination of the water with metacercariae. Killed crayfish were also preserved in water for some time. Physical stimuli in terms of mederate degree of shaking were added to the preserved water once a day and half amount of the water was replaced with tapped water of same temperature everyday. Status of the decay of the crayfish, liberation of the metacercariae from the body of the crayfish or contamination of the preserved water by the metacercariae, and numbers of metacercariae harboured in the body of the crayfish were examined everyday. The fate of the metacercariae liberated from the crayfish into water was also observed. Status of the decay of the crayfish, liberation of the metacercariae from the body of the crayfish or contamination of the preserved water by the metacercariae, and numbers of metacercariae harboured in the body of the crayfish were examined everyday. The fate of the metacercariae liberated from the crayfish into water was also observed. The results of this study can be outlined as follows: 1)No metacercaria was detected in the water which contained live crayfish infected with Paragonimus westermani. 2)The preserved water with dead or killed crayfish was found to be contaminated by the metacercariae of Paragonimus westemani, which had been caused by the decay and dispersion of the flesh of the crayfish. 3)The liberated metacercariae survived for 10 days in the water at 21-27 degrees C. The liberated metacercariae were found to be sinking into water of s.g. 1.000 with average velocity of 35.8 cm per minute.
在本研究中，作者观察了感染卫氏并殖吸虫的活体或死体相似拟螯虾对水污染的状况。用作材料的相似拟螯虾感染了大量卫氏并殖吸虫囊蚴。将活的相似拟螯虾长时间养在水中，然后检查水的沉积物，以确定囊蚴从相似拟螯虾体内释放是否导致水被囊蚴污染。杀死的相似拟螯虾也在水中保存一段时间。每天对保存的水进行一次适度摇晃的物理刺激，并每天用相同温度的自来水替换一半的水。每天检查相似拟螯虾的腐烂状况、囊蚴从相似拟螯虾体内的释放情况或保存的水被囊蚴污染的情况，以及相似拟螯虾体内携带的囊蚴数量。还观察了从相似拟螯虾释放到水中的囊蚴的命运。每天检查相似拟螯虾的腐烂状况、囊蚴从相似拟螯虾体内的释放情况或保存的水被囊蚴污染的情况，以及相似拟螯虾体内携带的囊蚴数量。还观察了从相似拟螯虾释放到水中的囊蚴的命运。本研究结果可概述如下：1）在含有感染卫氏并殖吸虫的活相似拟螯虾的水中未检测到囊蚴。2）发现装有死的或杀死的相似拟螯虾的保存水被卫氏并殖吸虫囊蚴污染，这是由相似拟螯虾肉体的腐烂和扩散所致。3）释放的囊蚴在21 - 27摄氏度的水中存活10天。发现释放的囊蚴以平均每分钟35.8厘米的速度沉入比重为1.000的水中。
