作者依据空斑中和试验（ PNT）滴度筛选出25名具有不同中和抗体水平的健康妇女。其中18人出生在美国石人有麻疹史，9人从未感染过麻疹，7人不详。有18人接种过麻疹疫苗（包括5名感染过麻疹者）。另选3名10～15月龄儿童和1名有麻疹病毒感染史的成 The authors screened 25 healthy women with different neutralizing antibody levels based on the plaque neutralization test (PNT) titer. Among them, 18 were born in the United States Shiren history of measles, 9 people have never been infected with measles, 7 unknown. Eighteen people have been vaccinated against measles (including five who have had measles). Another three children aged 10 to 15 months and one with a history of measles virus infection