Studies on INtestinal TRematodes in Korea XVII. Development and Egg Laying Capacity of Echinostoma hortense in Albino Rats ans Human Experimental Infection

한국의 장흡충에 관한 연구 XVII. 호르텐스극구흡충의 흰쥐내 발육, 충란산출양상 및 인체실험감염

The worm development and egg laying pattern of Echinostoma hortense (Trematoda; Echinosto-matidae) were studied in albino rats and the brief clinical course was observed in human volunteers. A total of 21 rats were infected with 20~69 metacercariae each and two humans were with 7 and 27 metacercariae, which were collected from the loaches. For recovery of worms, the rats were sacrificed at irregular intervals from the 6th to 150th day after infection and the human volunteers were treated with praziquantel and purged with magnesium salt on the 26~27th day. The stools of the rats and humans were examined for the eggs. The results were as follows: 1. The worm recovery rate from the rats was not affected by the increase of infection time but varied individually; 9.1~50.0% (31.1 % in average). From humans, 14.3% and 37.0% (32.4% in average) of challenged were recovered. 2. In the rats, it was revealed that the worms rapidly grew for the first 14 days to become 7.59mm in average length and 1.17mm in average width but the growth became much slower thereafter until the 150th day; 7.95mm in length on the 21 th day, 9.04mm on the 28th day, 10.21mm on the 49th day and 12. 62mm on the 150th day. During the early stage of infection, the growth of genital organs (male or female) was expressed as sigmoid curves whereas non-genital organs (such as suckers) was simply as straight lines. 3. The prepatent period of this fluke was 10~12 days in the rats and 16~17 days in men. After the start of oviposition, the egg production by the worms remarkably increased, reached maximum on the 32~33th day, followed by decrease thereafter. The maximum value of E.P.G./worm was 390. 4. The major subjective symptoms in human volunteers were abdominal pain and diarrhea during the early stage of infection. The results show that human is as susceptible as the rats to E. hortense infection and the amount of egg production in the rats is greatly affected by the age of worms.

호르텐스극구흡충(Echinostoma hortense)의 흰쥐내 발육양상, 충란산출양상 및 실험적 인체감염에 있어서의 간단한 임상 경과를 관찰하였다. 피낭유충은 미꾸리로부터 분리한 것을 사용하였고 흰쥐 21마리에 대하여 각각 20∼69개, 인체감염 지원자 2명에 대하여 각각 7개 및 27개를 감염시켰다. 흰쥐는 감염 6일부터 150일사이에 희생시킨 후 소장으로부터 충체를 회수하였고, 지원자는 감염 26∼27일후 praziquantel과 하제를 사용하여 치료하고 충체를 회수하였다. 1. 흰쥐로부터 충체회수율은 감염기간에 따라 거의 변동이 없었고, 그대신 개체별로 9.1∼50.0%(평균 31.1%)의 다양한 양상을 보였다. 인체 지원자에서는 14.3% 및 37.0%(평균 32.4%)의 회수율을 보였다. 2. 흰쥐에 있어서, 충체는 첫 14일 동안 매우 급격히 성장하여 평균 길이 7.59mm 폭 1.17mm에 달하였으나 그 후에는 150일까지 느린 성장을 보여 감염 21일후 길이 7.95mm, 28일후 9.04mm, 49일후 10.21mm 및 150일후 12.62mm로 성장하였다. 감염초기에 충체의 생식기관(웅성 또는 자성)은 2자장 성장곡선을 보였으나 비생식기관(흡반 등)은 단순한 직선장 곡선을 보였다. 3. 감염후 충체가 충란을 출산할 때까지의 기간은 흰쥐에서 10∼12일, 인체에서는 16∼17일이 소요되었다. 흰쥐에 있어서 충란출산량은 32∼33일경에 최고치에 달하고(390 E.P.G.) 그후 차차 감소하였다. 4. 인체감염에 있어서 감염초기(26∼27일)의 주요자각증상은 장통이었다. 이 결과는 인체가 흰쥐와 거의 마찬가지로 호르텐스극구흡충에 잘 감염될 수 있으며, 또 흰쥐에서의 충란출산은 충체의 감염연령에 따라 크게 좌우됨을 나타내는 것으로 해석되었다.