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总结
文章解释流感或感冒后咳嗽拖到三周是否仍具传染性，以及哪些情况属于“正常恢复”。一般在发热等急性症状消退后，传染性会明显下降，但气道炎症和咳嗽反射敏感可使干咳持续数周。若咳嗽超过3周仍无好转或逐步加重，且伴呼吸困难、胸痛、咳血、高热、体重下降，或有慢病、免疫低下、吸烟史，应尽快就医排查肺炎、哮喘、反流等原因，并通过补水休息、避免烟尘刺激帮助恢复。
正文
Is that three-week cough still contagious? What's normal, why it lingers and what to look out for CNA Lifestyle Coughing Weeks After the Flu, When Should You Be Alert? VOI.id NHS says see a GP if you've had a cough for this many weeks Daily Record When should you worry about a persistent cough? saga.co.uk Why Winter Cough Lingers: Here's How Daily Habits Affect Recovery NDTV
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