1背景居住在疟疾高发区的妇女在第一次或第二次怀孕时比同龄的未孕妇女更易感染疟原虫而患疟疾(Brabin1983)。这种感染可能造成产前贫血(Brabin1990),胎儿发育迟缓(Kramer1987,Malawi1996)。这些影响对母亲和婴儿均可造成危害,所以预防、治疗及控制感染的手段是必须的。有三种 1 Background Women living in areas of high incidence of malaria are more likely to become infected with malaria than males of the same age on the first or second pregnancy (Brabin 1983). This infection can cause prenatal anemia (Brabin 1990), fetal retardation (Kramer 1987, Malawi 1996). These effects can be harmful to both mothers and infants, so preventing, treating and controlling the infection is a must. There are three kinds