[seroepidemiological surveillance and methodological study of pertussis, diphtheria and tetanus].in this paper, we studied the diagnostic method of dpt using pa method developed by japanese national institute of health (nih) in 1993-1994, meanwhile we surveyed the antibody level of dpt. we collected 900 sera samples and 300 sera samples from hebei province in 1993 and 1994. the result showed that pa method was simple, reliable and easy to observe, which can make up the shortages existed in pha method. the antitoxin titers obtained by the pa method correlated well with the pha method, while ...19957585903
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