二倍体型卫氏并殖吸虫引发重症病例及其疫源地调查

Severe infection of diploid tipe Paragonimus westermani and its epidemic focus investigation

目的根据一病例调查浙江省永嘉县大岙乡并殖吸虫虫种及其疫源地。材料与方法到达患者发病前生吃溪蟹处采集放逸短沟蜷、溪蟹和野猫粪便检查并殖吸虫尾蚴、囊蚴、虫卵,并检测形态和大小。结果螺、蟹和野猫粪便的并殖吸虫的尾蚴、囊蚴和虫卵的阳性率分别为0%(0/1006)、96.2%(25/26)、和50%(3/6)。其中25只阳性溪蟹中发现囊蚴13122个,平均505个/只,50个/g,大小在246～353μm。而虫卵呈金黄色,大小为73.4μm×42.6μm。成虫经作染色体检测为卫氏并殖吸虫二倍体型。结论浙江省永嘉县大岙乡为超高度卫氏并殖吸虫二倍体型肺吸虫病重疫区,由之引发重症人体并殖吸虫病。

The aim of the study was to investigate Paragonirnus species at Daqiao rural area in Yongjia county, Zhejiang provience in accordance with one case of severe infection of Paragonirnus westermani. Samples, including Semisulcospira liber- tine, Potamon denticulate, and the feces of wild cat, were collected. Moreover, cerearia in snail hosts, metaeercaria in crabs, and eggs in stool of wild cat ,were detected by morphology. It was found that the positive rate of cercaria, metacerearia, and eggs were0%（0/1006）,96.2 %（25/26）,and 50%（3/6）,respectively. There were 13 122 metacercaria dectected in Potamon denticulate samples （505/ each averagely） with the size of 246 353μm. In the feces detection, eggs were found with the size of 73.4 μm×42.6 μm. Furthermore, all the P. westermani adult were affirmed as diploid by chromosome testing.