It is also used during production of specific vaccines, for example certain pertussis (whooping cough) vaccines, as part of the manufacturing process that makes the product safe and effective.

作为生产过程中使产品安全有效的组成部分，它也被用于特定疫苗的生产，例如，某些百日咳疫苗。

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That can be a sign of pertussis, or whooping cough, which can be serious and has been more prevalent in the past few years.

那可能是百日咳的征兆，这可能很严重并在这几年越来越普遍。

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The surge in cases of whooping cough, or pertussis, is largely among adolescents and adults.

BBC: Whooping cough makes a comeback

Whooping cough, or pertussis, may look like just like a cold or a persistent cough in adults.

CNN: 9th baby in California dies from whooping cough

Whooping cough, also known as pertussis, can be a serious illness, especially in the very young.

BBC: Whooping cough cases increase in England and Wales