异盘并殖吸虫第二中间宿主感染情况的调查研究

在广西那坡县并殖吸虫流行区，从采集的弯肢溪蟹中发现异盘并殖吸虫囊蚴感染率达９８．５０％（１９７／２００），平均含囊蚴数－每蟹、每克分别是１２９．２３个、４．６１个。有一只４７克重雄蟹含囊蚴６６５３个，为目前最高纪录。按疫区等级划分，属超高度并殖吸虫疫源地。经统计学分析，两性溪蟹的感染度（每蟹含囊蚴数）随体重的增加而呈上升趋势，有显著差异（Ｐ＜０．０５），而感染率、每克含囊蚴数均与体重、性别无明显关

Investigation of the Infection of Paragonimus heterotremus in its Second Intermediate Host

An investigation of Potamon flexum Collected from an endemic area of Paragonimus het-erotremus in Napo County revealed that the metacercariae infection rate was as high as 98. 50%(197/200),with an average of 129.23 per crab weighing 47g contained as many as 6 653 metacercariae, which was thehighet record so far. According to the criteria of intensity of infection,the area would be considered as super-endemic. Statistical analysis showed that the intensity of infection(number of metacercariae per crab)wereincreased in both sexes with the increase of the body weight of the crabs(P0.05).As for the distribution of metacercariae in the body of crabs,the gills had the highest percentage(32. 44%),and in order from high to low they were cephalo-thorax muscle(25. 40%),legs(25. 20%),claw(7.32/),viscern(6. 48%),liver(2. 49%)and abdomen(0. 77%). The infection rates of the aforesaid vari-ous body parts were 100%,97. 97%,94. 92%,83. 76/,85. 28%,70. 56%and 44. 67%respectively.