广州北郊南昆山自然保护区卫氏并殖吸虫超高度疫源地首报

First Report of Nankun Mountain,Northern Suburban of Guangzhou as Paragonimus Westermani Uultra-high Infectious Focus

目的调查广州北郊南昆山自然保护区并殖吸虫流行分布状况。方法采集调查点山溪中螺蛳2012只，溪蟹63只，收集疫源地野山猫粪便3份，2只人工感染家猫粪便2份。检查并殖吸虫尾蚴、囊蚴和虫卵。解剖人工感染虫卵阳性猫，查找并殖吸虫成虫。结果螺蛳体并殖吸虫尾蚴感染率为0．15％。（3／2000）。螺种为放逸短沟蜷。蟹体卫氏并殖吸虫囊蚴感染率为100％（59／59）。感染度：2～516个囊蚴／只蟹，2～10个囊蚴／克蟹。蟹种为平和华溪蟹。2份野山猫粪便枪出并殖吸虫卵，感染率为66．66％（2／3）。解剖两只人工感染阳性猫检获卫氏并殖吸虫成虫11条。结论首次发现广州北郊南昆山自然保护区存在严重卫氏并殖吸虫流行，为超高度疫源地（I级）。鉴于卫氏并殖吸虫是我国主要致病并殖吸虫，该疫源地属国家级自然保护区，也是4A旅游区及著名的避暑胜地，游人如误饮用生山泉水，具有感染卫氏并殖吸虫的潜在危害，必须引起高度重视。

Objective To investigate the popularity and distribution of Paragonimus westermani in Nankun Mountain, Northern suburban of Guangzhou. Methods 2012 snails and 63 crabs were picked from creeks. Three feces samples of wild cats in epidemic area and two feces samples of domestic cats inoculated with P. westermani metacercariae were collected. The cercariae, metacercariae and eggs of P. westermani were detected. P. westermani - positive cats were identified by detection, in which adults of Paragonimus were checked. P, westermani eggs artificially inoculated were also anatomized. Results Infection ratio in snails was 0.15‰（3/2000） , while infection ratio of P. westermani metacercariae in crab was 100% （59/59） , with an intensity of infection of 2 -516 metacereariae per crab, and 2 -10 matacereariae per gram crab. Snails and crabs were identified to be Semisulcospira libertina type and Sinopotamon pinheense type, respectively. P. westermani eggs were also found in two feces samples from wild cats, with an infection ratio of 66.66% （2/3）. Eleven adults of P. westermani were found in two domestic cats inoculated with P. westermani. Conclusion Nankun Mountain in northern suburban of Guangzhou as an ultra - high infectious focus of P. westermani（ Grade I） is reported for the first time. In view of the fact that P. westermani is one of the major disease paragonimus and the infectious focus Nankun Mountain nature reserve is an 4 A scenic spot and popular summer resort, tourists can become infected by P. westermani by drinking water from streams, springs and ponds. More attention should be paid to prevent human infection with P. westermani in Nankun Mountain.