[Observation of immunity level of pertussis-diphtheria-tetanus in healthy people in Hangzhou City during 1995-2006].

Objective: To study the pertussis-diphtheria-tetanus immunity level of healthy people in Hangzhou.

Methods: Pertussis antibody, diphtheria antitoxin and tetanus antitoxin were tested. We carried out surveillance in different counties among the people at 2-4, 6-8, 13-15, 25-39 age group during 1995-2006.

Results: It showed that the pertussis antibody positive rate of 1942 persons was 93.87%, GMT 1: 1037.36 IU/ml, the antibody of people in countryside for the people at 2-4 age group was lower than that of other groups and the difference was significant compared with 6-8, 13-15 age group (chi2 = 8.80, 6.13, P < 0.01). The diphtheria antitoxin positive rate of 2141 persons was 91.59%, with the GMT was 0.2911 IU/ml. The tetanus antitoxin positive rate of 2141 persons was 72.35%, GMT 0.095 IU/ml.

Conclusions: We need to strengthen the EPI work in rural areas.