浙江宁海并殖吸虫中间宿主感染情况调查

2007年8月在宁海县深圳区俞山村现场捕捉溪蟹和川卷螺,镜检并殖吸虫囊蚴和尾蚴的感染情况。共捕获97只长江华溪蟹（Sinopotamon yangtsekiense）,阳性率为11.3%(11/97),平均感染度为1个囊蚴/只。其中, 体重＜5 g的20只, 阳性率为10%(2/20), 平均感染度为1个囊蚴/只; 体重>5 g的77只中,5～15 g的阳性率为10.2%（5/49）,平均感染度为1个囊蚴/只;15～25 g的阳性率为20.0%（4/20）, 平均感染度为1个囊蚴/只,25～35 g的阳性率为0（0/8）。体重>5 g的77只中,雄蟹与雌蟹比例为2.5 ∶ 1,阳性率分别为12.7%（7/55）和9.1%（2/22）,差异无统计学意义（χ²=1.20,P>0.05）。采集放逸短沟蜷（Semisulcospira libertina）200只,未发现阳性。

Epidemiological Investigation on the Intermediate Hosts of Paragonimus in Ninghai County of Zhejiang Province

Freshwater crabs and snails were collected from Ninghai County in Zhejiang Province, and examined respectively for Paragonimus metacercariae and cercariae. Among 97 freshwater crabs found, the prevalence was 11.3%(11/97) with a mean intensity of 1 metacercariae per crab. It was 10.2%（5/49） and 20.2%（4/20） in the groups weighted 5-15 g and 15-25 g respectively, with an average intensity of 1, and no metacercariae were found in weight group of 25-35 g. Two positive crabs were found from 20 crabs with a low weight （< 5 g）. Male to female crabs ratio was 2.5 ∶ 1, and there was no significant difference in prevalence between males ［12.7%（7/55）］ and females ［9.1%（2/22）］. No cercariae or metacercariae were found in 200 snails （Semisulcospira libertina）.