70年代初,某县为改善山区面貌,抽调一批农民成立一支民工队,专门开凿隧道,80年代初,该民工队解散回家务农。1986年后该民工队陆续发现了一批矽肺病人,为探讨其晚发矽肺的发生与发展,特对其进行回顾性调查分析。该民工队310人,截止1997年12月共发现Ⅰ期矽肺5例,Ⅱ期矽肺10例,Ⅲ In the early 1970s, in order to improve the mountainous area, a county mobilized a group of peasants to set up a migrant workers team to dig tunnels. In the early 1980s, the migrant workers dissolved and returned home to farm their crops. After 1986, the migrant workers have discovered a number of patients with silicosis, in order to explore the occurrence and development of its late silicosis, especially its retrospective investigation and analysis. The 310 migrant workers, as of December 1997 found a total of 5 cases of stage I silicosis, 10 cases of stage II silicosis, Ⅲ