Sore throat Warning: severe or persistent sore throat or sore throat that occurs with high fever, headache, nausea, and vomiting may be serious. Ask a doctor right away.

咽痛警告：加重或是持续的咽痛，或咽痛导致高烧，头痛，呕吐就是严重的情况，立即咨询医生。

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Older children and adults who have whooping cough often appear to have a bad cold or persistent cough that can be so severe that it causes vomiting.

CNN: Can breast-feeding prevent whooping cough?