一、材料和方法 1.实验对象:健康妇女未婚者105例,妊娠者150例。按妊娠期分为6组(见表)。第一胎率为90％,年龄在23～36,平均25.38岁。 2.实验方法:对未孕健康妇女进行集中采样,对怀孕各期的妇女来院就诊时采样。一律采集枕部近头皮短发,各自分装于纸质袋中。发样采全后进行洗涤,干燥,消化, First, materials and methods 1. Experimental subjects: 105 cases of unmarried women and 150 cases of pregnancy. According to gestational age is divided into 6 groups (see table). The first birth rate of 90%, aged 23 to 36, an average of 25.38 years old. 2. Experimental Methods: Unconcentrated healthy women were sampled centrally and women from different stages of pregnancy were sampled at the hospital. All collection of short scalp hair near the occipital, sub-packed in paper bags. After the whole sample was taken for washing, drying, digestion,