In 1990, the pertussis antibody level was detected in population of 206 persons, who were inoculated with DPT vaccine containing 4?5 billion bacillus pertussis/ml, the protection rate reached 34?47%.
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释义
1990年使用含百日咳菌45亿/ml百日破混合制剂(DPT),对206人检测抗体水平,保护率为34?47%25;
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