Methods Collect the information on anthropological, malaria knowledge, the using of bed-net, transfusion blood and migration with the pre-designed questionnaire and the method of case-control.

• 方法采用病例对照的流行病学调查方法，用预先设计的问卷收集人口学信息、疟疾知识、蚊帐使用、输血史和流动史等信息。