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。

youdao

The vaccination response of new absorbent pertussis mixed vaccine preparation was lower and its serological effect was better as well.

新配方百白破混合制剂接种反应较低，血清学效果也较好。

youdao

"However, 'they conclude," if such an increased risk exists, the absolute risk is extremely small and it is much lower after vaccination than after pertussis or measles.

不过，即使升高，其绝对危险性也极小，且远远低于百日咳或麻疹后患脑病的危险性。

youdao

The vaccination is intended to offer protection against pertussis, the bacteria that causes whooping cough, until babies are old enough to begin receiving their own vaccinations against the disease starting at 2 months of age.

WSJ: Panel Pushes Vaccine for Pregnant Women

Whooping cough, also known as pertussis, is more dangerous for young babies because they do not get the benefits from vaccination until about four months.

BBC: Newborn babies could get whooping cough vaccination