We had surveyed 897 healthy persons for diphtheria, pertussis and tetanus antibodies in 6 cities (Chengdu, Suining, Dachuan, Yaan, Guangyuan, Yibin) of Sichuan Province in 2001.

• 为了解四川省健康人群白喉、百日咳、破伤风的免疫状况,及时为免疫策略提供依据,2001年对成都等6个市897名健康者进行了白喉、百日咳、破伤风抗体水平监测。