Objective: To know the antibody levels of DDT and the immunization effect of DPT vaccine in health population in Shenzhen, and to provide theoretic basis for the immunization strategy of DPT.
Methods: Antibody of pertusis was tested by agglutination tests, antibodies of diphtheria and tetanus were tested by IHA tests.
Results: The antibody positive rate of diphtheria, pertusis and tetanus were 88.31%, 71.54% and 92.77% respectively. The protective rate were 87.38%, 64.15% and 37.23% respectively. The GMT of diphtheria, pertusis and tetanus were 0.2595, 0.5607 and 1:156.87 respectively.
Conclusion: The antibody levels of diphtheria, pertusis and tetanus decreased by age, we should carry out DT booster immunization in freshmen of middle school, colleges and adults.