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四川省西部系高山高原地带，从未发现过肺吸虫病（并殖吸虫病）患者及其中间宿主。本病主要流行于东部的四川盆地，据８０个县（市）的调查，流行区遍布于盆地的各个方位。病原的第一中间宿主主要为拟钉螺，第二中间宿主主要有锯齿华溪蟹等１８种淡水蟹（包括新发现６个新种及新亚种）。已发现豹猫和果子狸有自然感染，系野生动物保虫宿主。
In western Sichuan Province, alpine plateau has never been found in paragonimiasis (paragonimiasis) patients and their intermediate host. The disease prevails in the eastern Sichuan Basin. According to the survey conducted in 80 counties (cities), endemic areas are found in all directions of the basin. The first intermediate host of the pathogen was predatory snail, and the second intermediate host was mainly composed of 18 freshwater crabs (including 6 new species and new subspecies) newly discovered. Leopard cats and civet cats have been found to have natural infection, the Department of wildlife preserving hosts.