张××,男,20岁;阮××,男,22岁;均为河南籍人。两人经同乡介绍,于1989年10月下旬到海南省东方县采挖金矿,后于11月下旬转往珠海。在海南的一个月期间,两人与当地民工同宿一简易工棚,且无蚊帐及其它任何防蚊设施。张××在前往珠海途中路经湛江时即开始发病,曾在湛江,中山等地一路找个体开业医生诊 Zhang × ×, male, 20 years old; Nguyen × ×, male, 22 years old; are Henan nationals. Introduced by fellow villagers, they went to Dongfang County, Hainan Province for mining and gold mining in late October 1989 and transferred to Zhuhai in late November. During a month in Hainan, they shared a simple shelter with local migrant workers without mosquito nets and any other mosquito control facilities. Zhang × × on the way to Zhuhai en route to Zhanjiang when the disease began in Zhanjiang, Zhongshan and other places all the way to find an individual medical practitioners