We have a whooping cough vaccine, but it requires multiple doses, and the immunity keeps dropping.
我们有百日咳疫苗， 但需要多次接种，而且免疫力一直在下降。
| 单词 | Whooping cough vaccine |
| 释义 |
Whooping cough vaccine
原声例句
TED演讲（视频版） 2020年6月合集 We have a whooping cough vaccine, but it requires multiple doses, and the immunity keeps dropping. 我们有百日咳疫苗， 但需要多次接种，而且免疫力一直在下降。
英语百科
Pertussis vaccinePertussis vaccine is a vaccine that protects against whooping cough. There are two main types: whole-cell vaccines and acellular vaccines. The whole-cell vaccine is about 78% effective while the acellular vaccine is 71–85% effective. The effectiveness of the vaccines appears to decrease by between 2 and 10% per year with a more rapid decrease with the acellular vaccines. Vaccinating during pregnancy may protect the baby. The vaccine is estimated to have saved over half a million lives in 2002. |
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