他们还提到，由于担心以前的全细胞百日咳疫苗日渐增强的致反应力，因此不推荐对6岁以上年龄的青少年使用。
Previously vaccination against pertussis was not recommended for those over 6 years of age, they add, because of concerns of increased reactogenicity of the whole-cell vaccines.
他们还提到，由于担心以前的全细胞百日咳疫苗日渐增强的致反应力，因此不推荐对6岁以上年龄的青少年使用。
Previously vaccination against pertussis was not recommended for those over 6 years of age, they add, because of concerns of increased reactogenicity of the whole-cell vaccines.
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